Final year project

LAPAZ Tower

PART 3

CONSTRUCTION

(45%)

INTRUCTOR: VUONG DO TUAN CUONG

STUDENT : NGUYEN DUC DUY

CLASS

: 56XE

ID

:5655.56

TASK:

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CHAPTER I. INTRODUCTION OF CONSTRUCTION METHOD

I.1 PROJECT INFOMATION

I.1.1 Location

Project name:

Investor:

Location:

LAPAZ Tower

Danang Housing investment development joint stock company

38 Nguyen Chi Thanh, Thach Thang, Hai Chau district, Da Nang

city

Floor count:

19

Land area:

1000m2

Constructed area: 784m2

Floor area:

11232m2

North, South and East sides of the building are near residential areas.

West side is adjacent to Nguyen Chi Thanh Street.

I.1.2 Building structure

1) Foundation

Foundation system of the project includes:

Bored pile D1000: 66 piles.

Height of pile cap: h = 1.5 (m)

Tie beam: b x h = 500 x 700 (mm)

Because the elevation of pile top is not too deep from natural ground level and being

convenient for construction, bored piles will be constructed from the elevation of the

natural ground. The concrete level of bored pile is 1m beyond the pile cap bottom.

Afterwards, sand will be filled into the bored hole to natural ground level.

2) Basements

In this project, the building has 2 basements with the total depth of 6.4m from the

elevation of first floor and 4.4m from the natural ground level. Larssen sheet pile will be

used as retaining wall to protect excavation pit from landslide.

3) Superstructure

The structural system is combination of steel frame and reinforced concrete shear core.

The frame with steel column, composite beam and slab bear the vertical load. The shear

core bear the horizontal load.

The column and the beam are prefabricated in the factory. They will be transported and

installed in the construction site. The composite slab and shear core will be cast in situ.

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4) Ground water

In the area of this project, the ground water level is 7m deep under the natural ground

level. Therefore, ground water may have no effects on the construction of pile cap and

basements.

5) Transportation

The building is located in the city, so the material transportation time is depend on the law

of the city.

The access to the construction site is large. The material is supplied adequately and

continuously.

6) Electricity and water

Electricity and water for construction demand can be taken from the city network.

7) Residential environment

Around the construction area are houses and shops in operation, so the air and noise

pollution must be minimize maximally.

I.2 UNDERGROUND CONSTRUCTION METHOD

II.2.1 Excavation method

Excavation method is Bottom up method.

All the pits are excavated to design depth (bottom elevation of pile cap). Manual or

mechanical method can be both applied depends on the particular requirement of the

project. After the excavation, construction sequence will be started from basement to roof.

This method is applicable for project with medium excavation depth and can be executed

with simple construction machine.

Advantages:

Simple construction sequence, high level of accuracy. The construction solution for

basements is simple due to their similarity to the superstructure part.

Anti-leakage method for basements can be carried out easier.

Dewatering from the foundation pit is simpler by using water pump.

Disadvantages:

Difficult in construction for project with large depth of excavation (especially

when the top soil is weak).

Excavate without using sheetpile will require large construction area.

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Not safe for neighboring buildings.

Larssen sheet pile will be used as retaining wall to protect excavation pit from landslide.

II.2.2 Foundation construction method

For this project, using bored pile method.

Bored pile is a type of reinforced concrete pile which is used to support high building

which has heavy vertical load. Bored pile is a cast-in-place concrete pile where the bored

piles have to be cast on construction site.

Advantages:

Higher load bearing capacity.

Maintain stable shaft.

Ease to identify strata type.

Less any disturbance and subsidence to the surrounding areas.

Less noise and vibration.

Disadvantages:

Difficult to test quality.

The execution environment construction is muddy, dirty.

CHAPTER II. BORED PILE CONSTRUCTION

II.1 BORED PILE PARAMETERS

Bored pile parameters:

Diameter: D1000

Quantity: 66 piles

Elevation of pile tip: -30.0m

Pile cap height: 1.5m

Elevation of pile cap bottom: -5.9m

Tie beam: 500x700mm

Elevation of tie beam top: -5.2m

II.2 BORED PILE CONSTRUCTION TECHNIQUE

Bored pile construction sequence:

Preparation.

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Positioning.

Casing lowering.

Drilling.

Betonite pumping.

Acceptance of bored hole depth.

Reinforcement cage lowering.

Tremie pipe installing.

Bored hole flushing.

Concrete pouring.

Quality control.

LAPAZ Tower

II.2.1 Pile boring

1. Hydraulic rig/manually operable auger should be mobilized at the required location

2. Four reference points (making two lines perpendicular to each other) should be marked

for checking centre of pile bore during boring of pile.

3. Initial boring of about 2.0 meters is to be done using cutting tool of desired diameter of

pile

4. Then boring will be carried out according to the sub-soil investigation report of that

location by using bentonite.

5. The temporary guide casing, approximately 5.0 meter length with outside diameter

equivalent to nominal diameter of the pile, may then lowered in the bore hole.

6. Position / centerline of the guide casing pipe with reference to pile reference points

already fixed around the pile location shall be checked to shift/adjust the casing pipe to

ensure proceeding of drilling at exact pile location without any deviation.

7. Boring has to be done up to the founding strata as per drawings/ pre decided depth

using intermittently bentonite slurry as per requirement. In case of requirement the bored

hole is then supplied with bentonite slurry, from bentonite installation. Bentonite

circulation channel will be made from bored hole to bentonite tank and fresh bentonite

slurry will be pumped to bore hole through hose pipes. 24 hours prior to start of pile

boring, ensure that bentonite is completely dispersed and the water and attains required

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density to stabilize the sides of bore hole during drilling. Bentonite slurry of specified

quality should be circulated continuously during boring process.

8. Bentonite used to stabilize the sides of bore hole should be conforming to requirements

as listed in inspection and test plan. Density of bentonite solution should be checked

during boring operation to ensure that the density is about 1.05 g/cm3 to 1.15 g/ cm3,

marsh cone viscosity 18s to 45s and pH value 7 to 9.

9. Bentonite slurry is pumped by high pressure reciprocating pumps/ vertical pumps into

the bored hole and the same is allowed to overflow the bored hole. The overflow slurry

with bored mud/soil that comes out along with bentonite slurry is passed through channels

and is collected in sediment tanks where sediments settle and bentonite can be reused. If

necessary, the bentonite may be passed through the sand-filter tank to remove sand

particles before it is reused.

10. Depth of pile shall be checked with sounding chain and exact depth shall be recorded

in the pile report.

II.2.2 Reinforcement Cage Lowering

1. Prefabricated reinforcement cage prepared as following the drawings and approved

depths, is brought and kept near pile location while boring is in progress.

2. After getting the permission from the engineer, the reinforcement cage will be gently

lifted and lowered by crane/manually into the bored hole. Necessary concrete cover will

be obtained by using the concrete circular cover blocks (spacers) already made of the

same strength as of pile.

3. If the reinforcement cage is very long and not possible to handle in one lift, the cage

will be lifted one by one and spot welded at the joints and then lowered inside the bored

hole.

4. It is to be checked whether the reinforcement cage has reached up to bottom of the pile

by measuring from the top of the cage to the ground level.

II.2.3 Flushing

1. After cage lowering, 250 mm diameter tremie pipes in suitable lengths are to be

lowered in the hole. The operation is done by lowering one tremie pipe after another and

connecting them threading to maintain water tightness throughout its length till the gap

between the pile base and Tremie is between75 – 100 mm. the tremie pipe is

locked/supported from top to maintain the level and funnel is attached on top.

2. The tremie head to be provided to the tremie pipe for the flushing activity. The bore is

flushed by fresh bentonite slurry through the tremie head. The pumping for flushing is

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done by use of mud circulation pump. Flushing will be done to remove all the loose

sediments which might have accumulated on the founding strata. Further, the flushing

operation shall be continued till the consistency of inflowing and out flowing slurry is

similar.

II.2.4 Pile Concreting

1. The concrete placing shall not proceed if desity of fluid near about the bottom of

borehole exceeds 1.15 g/ cm3

2. Determination of the density of the drilling mud from the base of the borehole shall be

carried out by taking samples of fluid by suitable slurry sample approved by the engineer

in charge, in first few piles and at suitable interval of piles thereafter and the results

recorded.

3. After flushing is completed, tremie head should be removed and funnel should be

attached to the tremie pipe.

4. The slump of the concrete will be maintained at 180 mm to 200 mm.

5. Concreting operation will be carried out using the 50 mm diameter tremie pipes.

6. Initial charge of concrete should be given in the funnel using a plug. Total concrete

quantity in the funnel should be more than the volume of the entire pipe plus free space

below the tremie. This will ensure a water tight concrete pouring through tremie.

7. Lifting and lowering is repeated keeping sufficient concrete in funnel all the time. As

the concreting proceeds the tremie pipe are to be removed one by one, taking care that the

tremie pipe has sufficient embedment in the concrete until the whole pipe is concreted.

Sufficient head of green concrete shall be maintained to prevent inflow of soil or water in

to concrete. Placing of concrete shall be a continuous process from the toe level to top of

pile.

8. The concrete is poured in the funnel. As the concrete reaches the top of the funnel, the

plug is lifted up to allow the concrete to flow corresponding to the placing of each batch

of concrete.

9. The concreting of pile is to be done up to 1000 mm above the cut off level to get good

and sound concrete at cut off level.

10. After completion of concreting tremie, funnel and other accessories are to be washed

properly and kept greased in proper stacking condition near next pile location.

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II.3 CALCULATION OF CONSTRUCTION PARAMETERS

II.3.1 Excavating soil volume

The pile tip is 30m deep from the natural ground level. The volume of soil that need to be

excavated per D1000 pile:

12

V � �30 23.56(m 3 )

4

Use backhoe to move generated spoil onto dump trucks.

II.3.2 Bentonite volume

During pile boring process, bentonite slurry is circulated continuously.

Bentonite volume for a bored hole:

12

V � �30 �1.2 28.27(m3 )

4

Bentonite volume for 1 day in construction site:

28.27 �2 56.54(m3 )

Select one 50 m3-fresh-bentonite-storage-tank and one 25m3-used-bentonite-storage-tank.

II.3.3 Concrete volume

For D1000 bored pile:

12

V � �30 �1.15 27.10( m3 )

4

Coefficient 1.15 accounts for the extra concrete volume due to the increase in diameter of

bored hole.

II.3.4 Construction machine

1) Pile boring machine

Select pile boring machine: HITACHI KH-100 having the following parameters:

Boom length ( m )

19

Bored pile diameter ( mm )

6001500

Maximum drilling depth ( m )

43

Drilling speed ( rev/min )

1224

Drilling moment ( KNm )

4051

Weight ( T )

36.8

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Figure III. 1 Pile boring machine HITACHI KH-100

2) Bentonite mixing machine

Due to the required volume of bentonite is 56.54m3 per day, select bentonite mixing

machine BE-15A with the following parameters:

Machine

Mixing tank volume (m3)

Productivity (m3/h)

Pressure (kN/m2)

BE-15A

1.5

15-18

1.5

3) Bentonite pumping machine

Pumping machine

Productivity (m3/h)

Duct diameter (mm)

Pumping pressure (kG/cm2)

4) Air compressor

Air compressor

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BSA 1002SV

20

150

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Capacity (kW)

Pressure (kG/cm2)

Air flow (l/min)

Selft-weight (kG)

5) Concrete mixer truck

Select DONGFENG12 concrete mixer truck (12m3 concrete mixer tank)

DONGFENG12 concrete mixer truck

Concrete capacity (m3)

Water tank capacity (m3)

Weight (T)

Output material speed (m3/min)

Average speed (km/h)

3.7

12

560

55

12

0.4

31

2

30

Effective concrete volume: 0.8 x 12 = 9.6m3

Time for a concrete truck to finish pouring concrete: 9.6 / 2 4.8(mins)

Use 3 concrete trucks with 5-10 minutes away from each other to pour concrete for one

bored pile.

6) Dump truck

Soil volume of one bored hole:

12

V � �30 23.56(m3 )

4

Time for boring 1 hole: 150 (minutes).

Select HUYNDAI HD270 dump truck having capacity 10m3.

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Effective amount of soil: 0.8 x 10 = 8m3

Dumping location is 10km far from the construction site.

Average speed of dump truck: 30 km/h

Time for two-way-trip of a dump truck: t=tf + tt + td +tb

Where:

tf: Time for filling soil into dump bed (5 mins)

tt: Time for travelling 10k distance with average speed: 30km/h (20 mins)

td: Time for dumping and turning (5 mins)

tb: Time for getting back to construction site (20 mins)

t=tf + tt + td +tb=50 minutes

150

�8 24( m3 )

In 150 minutes, 1 dump truck can transport: 50

Select 1 dump truck for 1 bored pile.

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7) Crawler Crane

Crane is used to lift up the reinforcement cages, casing pipe, tremie pipe. The weight of

casing pipe is about 0.5 Ton and the weight of the reinforcement cage is approximately

2.3T.

The follow parameters are used to select a suitable crawler crane for bored pile

construction:

Required capacity of crane: Q=2.3 T

Required height:

H = h 1 + h 2 + h 3 + h4

Where:

h1=0.5m: Safety distance

H2=11.7m: Length of reinforcement cage

H3=1.5m: Length of hanging equipment

H4=1.5: pulley length

H = h1 + h2 + h3 + h4 =15.2m

Required length of boom:

Lmin

H hc 15.2 1.5

14.18(m)

sin 750

sin 750

Required working radius:

R Lmin �cos 750 1.5 5.17( m)

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Use HITACHI KH100 to lift up reinforcement cage, casing pipes, tremie pipes, etc with

the specification:

Working radius: 16m

Boom length: 19m

Load capacity: 2.75Ton

Figure III. 2 Specification of crawler crane HITACHI KH100

8) Excavator

Select Backhoe KOMATSU PC220LC-8 with the following parameters:

3

Bucket volume: q 1.0(m )

Weight:

25.5 T

Maximum digging reach at ground level: R 10.02( m)

Maximum dump height h 7.035(m)

Dumping radius rd 3.84( m)

Maximum digging depth H 6.92(m)

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Slewing cycle: T 17(s )

Figure III. 3 Backhoe KOMATSU PC220LC-8

Productivity:

k

N q � d �ncycle �ktime

kt

Where:

q 1.0(m3 ) : Bucket volume

kd 0.95 : Factor of full-filling bucket

kt 1.15 : Swell factor

ktime 0.8

: Time factor

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ncycle

3600

tcycle �kdw �kslewing

kdw 1.1

: Factor of soil dumping method

k slewing 1

tcycle 17( s )

: Slewing cycle

k

0.95 � 3600 �

N q � d �ncycle �k 1.4 �

��

�0.8 178.12(m3 / h)

�

kt

1.15 �

17 �1.1 �1 �

3

Productivity of backhoe per shift: N 178.12 �8 1424.98(m / shift)

II.3.5 Construction time

Construction time for one bored pile:

Move auger into boring position: 20 minutes.

Pile center positioning: 15 minutes.

Initial boring and casing pipe lowering: 10 minutes.

Boring to the elevation of -30.0 m from the natural ground level.

The productivity of auger is 15m3/h.

23.56

1.57(h) 94(mins)

15

Time for boring a D1000 pile:

Check the bored hole bottom elevation: 10 minutes.

Wait for deposition: 45 minutes.

Bored hole dredging (1st): 15 minutes.

Lower reinforcement cages: 60 minutes.

Lower tremie pipe: 60 minutes.

Bored hole flushing (2nd): 30 minutes.

Check bore hole bottom elevation: 15 minutes.

Pour concrete: 100 minutes

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Remove casing pipe: 20 minutes.

Back filling: 20 minutes.

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Total construction time of a bored pile:

T=20+15+10+94+10+45+15+60+60+30+15+100+20+20=514 minutes.

T=8hours 34 minutes.

II.3.6 Machine movement

In accordance with Article 7.1 – TCVN 9395:2012 – “Bored Pile: Construction, Check

and Acceptance”, boring work of bored hole that is between two finished bored pile

should be executed at least 24 hours after the completion of concrete work.

2 working crews work simultaneously.

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END

END

BEGINNING

BEGINNING

Figure III. 4 Machine movement in bored pile construction

Total movement of working crew 1: 248m.

Total movement of working crew 2: 245m.

II.3.7 Man power

Required man power for one crew:

Controlling auger: 1 worker.

Controlling crane: 1 worker.

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Controlling backhoe: 1 worker.

Supporter for drilling work: 1 worker.

Labors for reinforcement work: 10 workers.

Labors for concrete work: 10 workers.

Labors for bentonite work: 2 workers.

Electrician: 1 worker.

Setting theodolite: 3 workers.

Two working crews work silmutaneously in bored pile construction. So total labor for

bored pile construction in one day is 60 labors.

CHAPTER III.

SHEET PILE CONSTRUCTION

III.1. CONSTRUCTION SOLUTION

According to the underground construction requirement and bored pile solution, the

construction method for underground work are shown as below:

Install sheet pile system around the perimeter of the construction area.

Excavate by manual 1.2m deep from the natural ground.

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Install the anchorage system.

Excavate by excavator 5.9m from level the natural ground to the level -5.9m.

Excavate 0.1m from level -5.9m and fix the foundation pit manually.

Advantages of using sheet pile:

High strength.

Brace is not required or just a few.

Anchorage can be used to keep the stability.

Economic efficiency.

III.2. CALCULATION OF LARSSEN SHEET PILE

III.2.1 Geotechnical data

Table III. 1 Table of geotechnical data

No. Soil layer

Backfilling

1 soil

2 Clay mud

3 Clay sand

Brown

4 sandy clay

Grey sandy

5 clay

Grey clay

6 rock

Thic

knes

s

W

(%)

(g/

(g/

cm3) cm3)

4.0

17.52

2.66

5.8

1.6

51.23

28.49

1.70 2.64 18.69

1.86 2.68 9.24

0.063

0.091

5°54'

10°33'

6.2

18.11

2.06 2.68 8.70

0.152

13°56'

3.1

23.26

1.95 2.69 12.78

0.187

13°24'

18

110

21.23

1.97 2.71 12.08

0.244

19°20'

90

120

Ip

C

(kG/

cm2)

(degree)

E1-2

SPT (kG/

cm2)

7

1

9

11

30

60

110

At the time of this survey, the groundwater is at the elevation of - 7.0 (m) from natural

ground.

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III.2.2 Larssen sheet pile calculation

1) Preliminary selection of Larssen sheet pile

Figure III. 5 Larssen sheet pile dimensions and Sectional Properties

Preliminarily select larssen sheet pile type II with the properties:

Sectional area: 61.18cm2.

Weight: 48kg/m.

Moment of inertia: 1.240cm4.

Section modulus: 152cm3.

2) Sheet pile calculation

Calculation requirement:

Calculate the sheet pile depth fixed on the soil to bear the positive pressure of soil.

The displacement of pile top is satisfied to the limit displacement.

Diagram of the sheet pile:

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0.00

-4.00

-6.00

-9.80

-11.40

-17.60

Figure III. 6 Diagram of Larssen sheet pile.

Arccording to Rankine’s theory, calculate the positive and negative soil pressure. Then,

calculate the sheet pile depth fixed on the soil to be satisfied to the stable condition.

Kc, Kb are the positive and negative soil pressure ratio respectively. They are calculated as

below formulas:

K c tg 2 (45o )

K b tg 2 (45o )

2 and

2

Table III. 2 Positive and negative soil pressure ratio

g(T/m3)

Kc

Kb

Backfilling

4

soil

2.66

10.5

0.69

1.44

Clay mud

2.64

5.9

0.81

1.23

No.

Soil layer

1

2

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3

Sandy clay

and clay

1.6

sand

2.68

10.5

0.69

1.44

4

Brown

sandy clay

2.68

13.9

0.61

1.63

6.2

Positive soil pressure:

Pc ( z ) K c � �z 2 �c � K c q �K c

Negative soil pressure:

Pc ( z ) K b � �z 2 �c � K b q �K b

q = 1T/m2: Load account for the weight of the machine moving near the foundation pit.

a) Calculate the sheet pile depth fixed on the soil to bear the positive pressure of soil:

Determine the positvive soil pressure:

Soil layer 1:

z=0

Pc ( z 0) K c � �z q �K c 1�0.69 0.69(T / m 2 )

z=4

Pc ( z 4) K c � �z 2 �c � K c q �K c

0.69 �2.66 �4 2 �0.91� 0.69 1�0.69 6.5(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec1 �H ��

Pc z 0 Pc z 4 �

�4 � 0.69 6.5 14.38(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H1

0.69 2 �6.5 4

� 2.54(m)

0.69 6.5

3

Soil layer 2:

z=4

Pc ( z 4) K c � �z 2 �c � K c q �K c

0.81�2.64 �4 2 �0.63 � 0.81 1�0.81 8.23(T / m 2 )

z=9.8

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Pc ( z 9.8) K c � �z 2 �c � K c q �K c

0.81�2.64 �9.8 2 �0.63 � 0.81 1�0.81 20.63(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec 2 �H ��

Pc z 4 Pc z 9.8 �

�5.8 � 8.23 20.63 83.69(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H2 4

8.23 2 �20.63 5.8

� 7.3(m)

8.23 20.63

3

Soil layer 3:

z=9.8

Pc ( z 9.8) K c � �z 2 �c � K c q �K c

0.69 �2.68 �9.8 2 �0.91� 0.69 1�0.69 17.3(T / m 2 )

z=11.4

Pc ( z 11.4) K c � �z 2 �c � K c q �K c

0.69 �2.68 �11.4 2 �0.91� 0.69 1�0.69 20.25(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 3 �1.6 ��

Pc z 9.8 Pc z 11.4 �

�

�

2

1

�1.6 � 17.3 20.25 30.04(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 3 9.8

17.3 2 �20.25 1.6

� 10.62(m)

17.3 20.25

3

-Soil layer 4:

z=11.4

Pc ( z 11.4) K c � �z 2 �c � K c q �K c

0.61�2.68 �11.4 2 �1.52 � 0.61 1�0.61 16.9(T / m 2 )

z=11.7

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Pc ( z 11.7) K c � �z 2 �c � K c q �K c

0.61�2.68 �11.7 2 �1.52 � 0.61 1�0.61 17.36(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 3 �0.3 ��

Pc z 11.4 Pc z 11.7 �

�

�

2

1

�0.3 � 16.9 17.36 5.14(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 3 11.6( m)

Determine the negative soil pressure:

Soil layer 2:

z=0

Pc ( z 0) K c � �z 2 �c � K c q �K c 0(T / m 2 )

z=3.8

Pc ( z 3.8) K c � �z 2 �c � K c q �K c

0.81�2.64 �3.8 2 �0.63 � 0.81 1�0.81 10.07(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec1 �H ��

Pc z 0 Pc z 3.8 �

�3.8 � 0 10.07 19.13(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H1 0

0 2 �19.13 3.8

� 2.53( m)

0 19.13

3

Soil layer 3:

z=3.8

Pc ( z 3.8) K c � �z 2 �c � K c q �K c

0.69 �2.68 �3.8 2 �0.91� 0.69 1�0.69 9.23(T / m2 )

z=5.4

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Pc ( z 5.4) K c � �z 2 �c � K c q �K c

0.69 �2.68 �5.4 2 �0.91� 0.69 1�0.69 12.18(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 2 �1.6 ��

Pc z 3.8 Pc z 4 �

�

�

2

1

�1.6 � 9.23 12.18 17.13(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 2 3.8

9.23 2 �12.18 1.6

� 4.64( m)

9.23 12.18

3

Soil layer 4:

z=5.4

Pc ( z 5.4) K c � �z 2 �c � K c q �K c

0.61�2.68 �5.4 2 �1.52 � 0.61 1�0.61 11.8(T / m2 )

z=5.7

Pc ( z 5.7) K c � �z 2 �c � K c q �K c

0.61�2.68 �5.7 2 �1.52 � 0.61 1�0.61 12.29(T / m2 )

+ Positive soil pressure on 1-m width:

1

Ec 2 �0.3 ��

Pc z 5.4 Pc z 5.7 �

�

�

2

1

�0.3 � 11.8 12.29 3.61(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 2 5.4

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11.8 2 �12.29 0.3

� 5.55( m)

11.8 12.29

3

25

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PART 3

CONSTRUCTION

(45%)

INTRUCTOR: VUONG DO TUAN CUONG

STUDENT : NGUYEN DUC DUY

CLASS

: 56XE

ID

:5655.56

TASK:

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CHAPTER I. INTRODUCTION OF CONSTRUCTION METHOD

I.1 PROJECT INFOMATION

I.1.1 Location

Project name:

Investor:

Location:

LAPAZ Tower

Danang Housing investment development joint stock company

38 Nguyen Chi Thanh, Thach Thang, Hai Chau district, Da Nang

city

Floor count:

19

Land area:

1000m2

Constructed area: 784m2

Floor area:

11232m2

North, South and East sides of the building are near residential areas.

West side is adjacent to Nguyen Chi Thanh Street.

I.1.2 Building structure

1) Foundation

Foundation system of the project includes:

Bored pile D1000: 66 piles.

Height of pile cap: h = 1.5 (m)

Tie beam: b x h = 500 x 700 (mm)

Because the elevation of pile top is not too deep from natural ground level and being

convenient for construction, bored piles will be constructed from the elevation of the

natural ground. The concrete level of bored pile is 1m beyond the pile cap bottom.

Afterwards, sand will be filled into the bored hole to natural ground level.

2) Basements

In this project, the building has 2 basements with the total depth of 6.4m from the

elevation of first floor and 4.4m from the natural ground level. Larssen sheet pile will be

used as retaining wall to protect excavation pit from landslide.

3) Superstructure

The structural system is combination of steel frame and reinforced concrete shear core.

The frame with steel column, composite beam and slab bear the vertical load. The shear

core bear the horizontal load.

The column and the beam are prefabricated in the factory. They will be transported and

installed in the construction site. The composite slab and shear core will be cast in situ.

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4) Ground water

In the area of this project, the ground water level is 7m deep under the natural ground

level. Therefore, ground water may have no effects on the construction of pile cap and

basements.

5) Transportation

The building is located in the city, so the material transportation time is depend on the law

of the city.

The access to the construction site is large. The material is supplied adequately and

continuously.

6) Electricity and water

Electricity and water for construction demand can be taken from the city network.

7) Residential environment

Around the construction area are houses and shops in operation, so the air and noise

pollution must be minimize maximally.

I.2 UNDERGROUND CONSTRUCTION METHOD

II.2.1 Excavation method

Excavation method is Bottom up method.

All the pits are excavated to design depth (bottom elevation of pile cap). Manual or

mechanical method can be both applied depends on the particular requirement of the

project. After the excavation, construction sequence will be started from basement to roof.

This method is applicable for project with medium excavation depth and can be executed

with simple construction machine.

Advantages:

Simple construction sequence, high level of accuracy. The construction solution for

basements is simple due to their similarity to the superstructure part.

Anti-leakage method for basements can be carried out easier.

Dewatering from the foundation pit is simpler by using water pump.

Disadvantages:

Difficult in construction for project with large depth of excavation (especially

when the top soil is weak).

Excavate without using sheetpile will require large construction area.

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Not safe for neighboring buildings.

Larssen sheet pile will be used as retaining wall to protect excavation pit from landslide.

II.2.2 Foundation construction method

For this project, using bored pile method.

Bored pile is a type of reinforced concrete pile which is used to support high building

which has heavy vertical load. Bored pile is a cast-in-place concrete pile where the bored

piles have to be cast on construction site.

Advantages:

Higher load bearing capacity.

Maintain stable shaft.

Ease to identify strata type.

Less any disturbance and subsidence to the surrounding areas.

Less noise and vibration.

Disadvantages:

Difficult to test quality.

The execution environment construction is muddy, dirty.

CHAPTER II. BORED PILE CONSTRUCTION

II.1 BORED PILE PARAMETERS

Bored pile parameters:

Diameter: D1000

Quantity: 66 piles

Elevation of pile tip: -30.0m

Pile cap height: 1.5m

Elevation of pile cap bottom: -5.9m

Tie beam: 500x700mm

Elevation of tie beam top: -5.2m

II.2 BORED PILE CONSTRUCTION TECHNIQUE

Bored pile construction sequence:

Preparation.

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Positioning.

Casing lowering.

Drilling.

Betonite pumping.

Acceptance of bored hole depth.

Reinforcement cage lowering.

Tremie pipe installing.

Bored hole flushing.

Concrete pouring.

Quality control.

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II.2.1 Pile boring

1. Hydraulic rig/manually operable auger should be mobilized at the required location

2. Four reference points (making two lines perpendicular to each other) should be marked

for checking centre of pile bore during boring of pile.

3. Initial boring of about 2.0 meters is to be done using cutting tool of desired diameter of

pile

4. Then boring will be carried out according to the sub-soil investigation report of that

location by using bentonite.

5. The temporary guide casing, approximately 5.0 meter length with outside diameter

equivalent to nominal diameter of the pile, may then lowered in the bore hole.

6. Position / centerline of the guide casing pipe with reference to pile reference points

already fixed around the pile location shall be checked to shift/adjust the casing pipe to

ensure proceeding of drilling at exact pile location without any deviation.

7. Boring has to be done up to the founding strata as per drawings/ pre decided depth

using intermittently bentonite slurry as per requirement. In case of requirement the bored

hole is then supplied with bentonite slurry, from bentonite installation. Bentonite

circulation channel will be made from bored hole to bentonite tank and fresh bentonite

slurry will be pumped to bore hole through hose pipes. 24 hours prior to start of pile

boring, ensure that bentonite is completely dispersed and the water and attains required

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density to stabilize the sides of bore hole during drilling. Bentonite slurry of specified

quality should be circulated continuously during boring process.

8. Bentonite used to stabilize the sides of bore hole should be conforming to requirements

as listed in inspection and test plan. Density of bentonite solution should be checked

during boring operation to ensure that the density is about 1.05 g/cm3 to 1.15 g/ cm3,

marsh cone viscosity 18s to 45s and pH value 7 to 9.

9. Bentonite slurry is pumped by high pressure reciprocating pumps/ vertical pumps into

the bored hole and the same is allowed to overflow the bored hole. The overflow slurry

with bored mud/soil that comes out along with bentonite slurry is passed through channels

and is collected in sediment tanks where sediments settle and bentonite can be reused. If

necessary, the bentonite may be passed through the sand-filter tank to remove sand

particles before it is reused.

10. Depth of pile shall be checked with sounding chain and exact depth shall be recorded

in the pile report.

II.2.2 Reinforcement Cage Lowering

1. Prefabricated reinforcement cage prepared as following the drawings and approved

depths, is brought and kept near pile location while boring is in progress.

2. After getting the permission from the engineer, the reinforcement cage will be gently

lifted and lowered by crane/manually into the bored hole. Necessary concrete cover will

be obtained by using the concrete circular cover blocks (spacers) already made of the

same strength as of pile.

3. If the reinforcement cage is very long and not possible to handle in one lift, the cage

will be lifted one by one and spot welded at the joints and then lowered inside the bored

hole.

4. It is to be checked whether the reinforcement cage has reached up to bottom of the pile

by measuring from the top of the cage to the ground level.

II.2.3 Flushing

1. After cage lowering, 250 mm diameter tremie pipes in suitable lengths are to be

lowered in the hole. The operation is done by lowering one tremie pipe after another and

connecting them threading to maintain water tightness throughout its length till the gap

between the pile base and Tremie is between75 – 100 mm. the tremie pipe is

locked/supported from top to maintain the level and funnel is attached on top.

2. The tremie head to be provided to the tremie pipe for the flushing activity. The bore is

flushed by fresh bentonite slurry through the tremie head. The pumping for flushing is

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done by use of mud circulation pump. Flushing will be done to remove all the loose

sediments which might have accumulated on the founding strata. Further, the flushing

operation shall be continued till the consistency of inflowing and out flowing slurry is

similar.

II.2.4 Pile Concreting

1. The concrete placing shall not proceed if desity of fluid near about the bottom of

borehole exceeds 1.15 g/ cm3

2. Determination of the density of the drilling mud from the base of the borehole shall be

carried out by taking samples of fluid by suitable slurry sample approved by the engineer

in charge, in first few piles and at suitable interval of piles thereafter and the results

recorded.

3. After flushing is completed, tremie head should be removed and funnel should be

attached to the tremie pipe.

4. The slump of the concrete will be maintained at 180 mm to 200 mm.

5. Concreting operation will be carried out using the 50 mm diameter tremie pipes.

6. Initial charge of concrete should be given in the funnel using a plug. Total concrete

quantity in the funnel should be more than the volume of the entire pipe plus free space

below the tremie. This will ensure a water tight concrete pouring through tremie.

7. Lifting and lowering is repeated keeping sufficient concrete in funnel all the time. As

the concreting proceeds the tremie pipe are to be removed one by one, taking care that the

tremie pipe has sufficient embedment in the concrete until the whole pipe is concreted.

Sufficient head of green concrete shall be maintained to prevent inflow of soil or water in

to concrete. Placing of concrete shall be a continuous process from the toe level to top of

pile.

8. The concrete is poured in the funnel. As the concrete reaches the top of the funnel, the

plug is lifted up to allow the concrete to flow corresponding to the placing of each batch

of concrete.

9. The concreting of pile is to be done up to 1000 mm above the cut off level to get good

and sound concrete at cut off level.

10. After completion of concreting tremie, funnel and other accessories are to be washed

properly and kept greased in proper stacking condition near next pile location.

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II.3 CALCULATION OF CONSTRUCTION PARAMETERS

II.3.1 Excavating soil volume

The pile tip is 30m deep from the natural ground level. The volume of soil that need to be

excavated per D1000 pile:

12

V � �30 23.56(m 3 )

4

Use backhoe to move generated spoil onto dump trucks.

II.3.2 Bentonite volume

During pile boring process, bentonite slurry is circulated continuously.

Bentonite volume for a bored hole:

12

V � �30 �1.2 28.27(m3 )

4

Bentonite volume for 1 day in construction site:

28.27 �2 56.54(m3 )

Select one 50 m3-fresh-bentonite-storage-tank and one 25m3-used-bentonite-storage-tank.

II.3.3 Concrete volume

For D1000 bored pile:

12

V � �30 �1.15 27.10( m3 )

4

Coefficient 1.15 accounts for the extra concrete volume due to the increase in diameter of

bored hole.

II.3.4 Construction machine

1) Pile boring machine

Select pile boring machine: HITACHI KH-100 having the following parameters:

Boom length ( m )

19

Bored pile diameter ( mm )

6001500

Maximum drilling depth ( m )

43

Drilling speed ( rev/min )

1224

Drilling moment ( KNm )

4051

Weight ( T )

36.8

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Figure III. 1 Pile boring machine HITACHI KH-100

2) Bentonite mixing machine

Due to the required volume of bentonite is 56.54m3 per day, select bentonite mixing

machine BE-15A with the following parameters:

Machine

Mixing tank volume (m3)

Productivity (m3/h)

Pressure (kN/m2)

BE-15A

1.5

15-18

1.5

3) Bentonite pumping machine

Pumping machine

Productivity (m3/h)

Duct diameter (mm)

Pumping pressure (kG/cm2)

4) Air compressor

Air compressor

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BSA 1002SV

20

150

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Capacity (kW)

Pressure (kG/cm2)

Air flow (l/min)

Selft-weight (kG)

5) Concrete mixer truck

Select DONGFENG12 concrete mixer truck (12m3 concrete mixer tank)

DONGFENG12 concrete mixer truck

Concrete capacity (m3)

Water tank capacity (m3)

Weight (T)

Output material speed (m3/min)

Average speed (km/h)

3.7

12

560

55

12

0.4

31

2

30

Effective concrete volume: 0.8 x 12 = 9.6m3

Time for a concrete truck to finish pouring concrete: 9.6 / 2 4.8(mins)

Use 3 concrete trucks with 5-10 minutes away from each other to pour concrete for one

bored pile.

6) Dump truck

Soil volume of one bored hole:

12

V � �30 23.56(m3 )

4

Time for boring 1 hole: 150 (minutes).

Select HUYNDAI HD270 dump truck having capacity 10m3.

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Effective amount of soil: 0.8 x 10 = 8m3

Dumping location is 10km far from the construction site.

Average speed of dump truck: 30 km/h

Time for two-way-trip of a dump truck: t=tf + tt + td +tb

Where:

tf: Time for filling soil into dump bed (5 mins)

tt: Time for travelling 10k distance with average speed: 30km/h (20 mins)

td: Time for dumping and turning (5 mins)

tb: Time for getting back to construction site (20 mins)

t=tf + tt + td +tb=50 minutes

150

�8 24( m3 )

In 150 minutes, 1 dump truck can transport: 50

Select 1 dump truck for 1 bored pile.

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7) Crawler Crane

Crane is used to lift up the reinforcement cages, casing pipe, tremie pipe. The weight of

casing pipe is about 0.5 Ton and the weight of the reinforcement cage is approximately

2.3T.

The follow parameters are used to select a suitable crawler crane for bored pile

construction:

Required capacity of crane: Q=2.3 T

Required height:

H = h 1 + h 2 + h 3 + h4

Where:

h1=0.5m: Safety distance

H2=11.7m: Length of reinforcement cage

H3=1.5m: Length of hanging equipment

H4=1.5: pulley length

H = h1 + h2 + h3 + h4 =15.2m

Required length of boom:

Lmin

H hc 15.2 1.5

14.18(m)

sin 750

sin 750

Required working radius:

R Lmin �cos 750 1.5 5.17( m)

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Use HITACHI KH100 to lift up reinforcement cage, casing pipes, tremie pipes, etc with

the specification:

Working radius: 16m

Boom length: 19m

Load capacity: 2.75Ton

Figure III. 2 Specification of crawler crane HITACHI KH100

8) Excavator

Select Backhoe KOMATSU PC220LC-8 with the following parameters:

3

Bucket volume: q 1.0(m )

Weight:

25.5 T

Maximum digging reach at ground level: R 10.02( m)

Maximum dump height h 7.035(m)

Dumping radius rd 3.84( m)

Maximum digging depth H 6.92(m)

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Slewing cycle: T 17(s )

Figure III. 3 Backhoe KOMATSU PC220LC-8

Productivity:

k

N q � d �ncycle �ktime

kt

Where:

q 1.0(m3 ) : Bucket volume

kd 0.95 : Factor of full-filling bucket

kt 1.15 : Swell factor

ktime 0.8

: Time factor

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ncycle

3600

tcycle �kdw �kslewing

kdw 1.1

: Factor of soil dumping method

k slewing 1

tcycle 17( s )

: Slewing cycle

k

0.95 � 3600 �

N q � d �ncycle �k 1.4 �

��

�0.8 178.12(m3 / h)

�

kt

1.15 �

17 �1.1 �1 �

3

Productivity of backhoe per shift: N 178.12 �8 1424.98(m / shift)

II.3.5 Construction time

Construction time for one bored pile:

Move auger into boring position: 20 minutes.

Pile center positioning: 15 minutes.

Initial boring and casing pipe lowering: 10 minutes.

Boring to the elevation of -30.0 m from the natural ground level.

The productivity of auger is 15m3/h.

23.56

1.57(h) 94(mins)

15

Time for boring a D1000 pile:

Check the bored hole bottom elevation: 10 minutes.

Wait for deposition: 45 minutes.

Bored hole dredging (1st): 15 minutes.

Lower reinforcement cages: 60 minutes.

Lower tremie pipe: 60 minutes.

Bored hole flushing (2nd): 30 minutes.

Check bore hole bottom elevation: 15 minutes.

Pour concrete: 100 minutes

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Remove casing pipe: 20 minutes.

Back filling: 20 minutes.

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Total construction time of a bored pile:

T=20+15+10+94+10+45+15+60+60+30+15+100+20+20=514 minutes.

T=8hours 34 minutes.

II.3.6 Machine movement

In accordance with Article 7.1 – TCVN 9395:2012 – “Bored Pile: Construction, Check

and Acceptance”, boring work of bored hole that is between two finished bored pile

should be executed at least 24 hours after the completion of concrete work.

2 working crews work simultaneously.

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END

END

BEGINNING

BEGINNING

Figure III. 4 Machine movement in bored pile construction

Total movement of working crew 1: 248m.

Total movement of working crew 2: 245m.

II.3.7 Man power

Required man power for one crew:

Controlling auger: 1 worker.

Controlling crane: 1 worker.

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Controlling backhoe: 1 worker.

Supporter for drilling work: 1 worker.

Labors for reinforcement work: 10 workers.

Labors for concrete work: 10 workers.

Labors for bentonite work: 2 workers.

Electrician: 1 worker.

Setting theodolite: 3 workers.

Two working crews work silmutaneously in bored pile construction. So total labor for

bored pile construction in one day is 60 labors.

CHAPTER III.

SHEET PILE CONSTRUCTION

III.1. CONSTRUCTION SOLUTION

According to the underground construction requirement and bored pile solution, the

construction method for underground work are shown as below:

Install sheet pile system around the perimeter of the construction area.

Excavate by manual 1.2m deep from the natural ground.

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Install the anchorage system.

Excavate by excavator 5.9m from level the natural ground to the level -5.9m.

Excavate 0.1m from level -5.9m and fix the foundation pit manually.

Advantages of using sheet pile:

High strength.

Brace is not required or just a few.

Anchorage can be used to keep the stability.

Economic efficiency.

III.2. CALCULATION OF LARSSEN SHEET PILE

III.2.1 Geotechnical data

Table III. 1 Table of geotechnical data

No. Soil layer

Backfilling

1 soil

2 Clay mud

3 Clay sand

Brown

4 sandy clay

Grey sandy

5 clay

Grey clay

6 rock

Thic

knes

s

W

(%)

(g/

(g/

cm3) cm3)

4.0

17.52

2.66

5.8

1.6

51.23

28.49

1.70 2.64 18.69

1.86 2.68 9.24

0.063

0.091

5°54'

10°33'

6.2

18.11

2.06 2.68 8.70

0.152

13°56'

3.1

23.26

1.95 2.69 12.78

0.187

13°24'

18

110

21.23

1.97 2.71 12.08

0.244

19°20'

90

120

Ip

C

(kG/

cm2)

(degree)

E1-2

SPT (kG/

cm2)

7

1

9

11

30

60

110

At the time of this survey, the groundwater is at the elevation of - 7.0 (m) from natural

ground.

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III.2.2 Larssen sheet pile calculation

1) Preliminary selection of Larssen sheet pile

Figure III. 5 Larssen sheet pile dimensions and Sectional Properties

Preliminarily select larssen sheet pile type II with the properties:

Sectional area: 61.18cm2.

Weight: 48kg/m.

Moment of inertia: 1.240cm4.

Section modulus: 152cm3.

2) Sheet pile calculation

Calculation requirement:

Calculate the sheet pile depth fixed on the soil to bear the positive pressure of soil.

The displacement of pile top is satisfied to the limit displacement.

Diagram of the sheet pile:

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0.00

-4.00

-6.00

-9.80

-11.40

-17.60

Figure III. 6 Diagram of Larssen sheet pile.

Arccording to Rankine’s theory, calculate the positive and negative soil pressure. Then,

calculate the sheet pile depth fixed on the soil to be satisfied to the stable condition.

Kc, Kb are the positive and negative soil pressure ratio respectively. They are calculated as

below formulas:

K c tg 2 (45o )

K b tg 2 (45o )

2 and

2

Table III. 2 Positive and negative soil pressure ratio

g(T/m3)

Kc

Kb

Backfilling

4

soil

2.66

10.5

0.69

1.44

Clay mud

2.64

5.9

0.81

1.23

No.

Soil layer

1

2

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3

Sandy clay

and clay

1.6

sand

2.68

10.5

0.69

1.44

4

Brown

sandy clay

2.68

13.9

0.61

1.63

6.2

Positive soil pressure:

Pc ( z ) K c � �z 2 �c � K c q �K c

Negative soil pressure:

Pc ( z ) K b � �z 2 �c � K b q �K b

q = 1T/m2: Load account for the weight of the machine moving near the foundation pit.

a) Calculate the sheet pile depth fixed on the soil to bear the positive pressure of soil:

Determine the positvive soil pressure:

Soil layer 1:

z=0

Pc ( z 0) K c � �z q �K c 1�0.69 0.69(T / m 2 )

z=4

Pc ( z 4) K c � �z 2 �c � K c q �K c

0.69 �2.66 �4 2 �0.91� 0.69 1�0.69 6.5(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec1 �H ��

Pc z 0 Pc z 4 �

�4 � 0.69 6.5 14.38(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H1

0.69 2 �6.5 4

� 2.54(m)

0.69 6.5

3

Soil layer 2:

z=4

Pc ( z 4) K c � �z 2 �c � K c q �K c

0.81�2.64 �4 2 �0.63 � 0.81 1�0.81 8.23(T / m 2 )

z=9.8

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Pc ( z 9.8) K c � �z 2 �c � K c q �K c

0.81�2.64 �9.8 2 �0.63 � 0.81 1�0.81 20.63(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec 2 �H ��

Pc z 4 Pc z 9.8 �

�5.8 � 8.23 20.63 83.69(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H2 4

8.23 2 �20.63 5.8

� 7.3(m)

8.23 20.63

3

Soil layer 3:

z=9.8

Pc ( z 9.8) K c � �z 2 �c � K c q �K c

0.69 �2.68 �9.8 2 �0.91� 0.69 1�0.69 17.3(T / m 2 )

z=11.4

Pc ( z 11.4) K c � �z 2 �c � K c q �K c

0.69 �2.68 �11.4 2 �0.91� 0.69 1�0.69 20.25(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 3 �1.6 ��

Pc z 9.8 Pc z 11.4 �

�

�

2

1

�1.6 � 17.3 20.25 30.04(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 3 9.8

17.3 2 �20.25 1.6

� 10.62(m)

17.3 20.25

3

-Soil layer 4:

z=11.4

Pc ( z 11.4) K c � �z 2 �c � K c q �K c

0.61�2.68 �11.4 2 �1.52 � 0.61 1�0.61 16.9(T / m 2 )

z=11.7

Nguyen Duc Duy-565556-56XE

23

Final year project

LAPAZ Tower

Pc ( z 11.7) K c � �z 2 �c � K c q �K c

0.61�2.68 �11.7 2 �1.52 � 0.61 1�0.61 17.36(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 3 �0.3 ��

Pc z 11.4 Pc z 11.7 �

�

�

2

1

�0.3 � 16.9 17.36 5.14(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 3 11.6( m)

Determine the negative soil pressure:

Soil layer 2:

z=0

Pc ( z 0) K c � �z 2 �c � K c q �K c 0(T / m 2 )

z=3.8

Pc ( z 3.8) K c � �z 2 �c � K c q �K c

0.81�2.64 �3.8 2 �0.63 � 0.81 1�0.81 10.07(T / m 2 )

+ Positive soil pressure on 1-m width:

1

1

Ec1 �H ��

Pc z 0 Pc z 3.8 �

�3.8 � 0 10.07 19.13(T / m)

�

�

2

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H1 0

0 2 �19.13 3.8

� 2.53( m)

0 19.13

3

Soil layer 3:

z=3.8

Pc ( z 3.8) K c � �z 2 �c � K c q �K c

0.69 �2.68 �3.8 2 �0.91� 0.69 1�0.69 9.23(T / m2 )

z=5.4

Nguyen Duc Duy-565556-56XE

24

Final year project

LAPAZ Tower

Pc ( z 5.4) K c � �z 2 �c � K c q �K c

0.69 �2.68 �5.4 2 �0.91� 0.69 1�0.69 12.18(T / m 2 )

+ Positive soil pressure on 1-m width:

1

Ec 2 �1.6 ��

Pc z 3.8 Pc z 4 �

�

�

2

1

�1.6 � 9.23 12.18 17.13(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 2 3.8

9.23 2 �12.18 1.6

� 4.64( m)

9.23 12.18

3

Soil layer 4:

z=5.4

Pc ( z 5.4) K c � �z 2 �c � K c q �K c

0.61�2.68 �5.4 2 �1.52 � 0.61 1�0.61 11.8(T / m2 )

z=5.7

Pc ( z 5.7) K c � �z 2 �c � K c q �K c

0.61�2.68 �5.7 2 �1.52 � 0.61 1�0.61 12.29(T / m2 )

+ Positive soil pressure on 1-m width:

1

Ec 2 �0.3 ��

Pc z 5.4 Pc z 5.7 �

�

�

2

1

�0.3 � 11.8 12.29 3.61(T / m)

2

+ The distance from the point that the concentrated positive force put on to the

natural ground.

H 2 5.4

Nguyen Duc Duy-565556-56XE

11.8 2 �12.29 0.3

� 5.55( m)

11.8 12.29

3

25

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