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Prepared by : En’am Sab’ Elaish Nour Kananh Majdolin Yasen Submitted to: Sami Al- Hijawe. Project 2. Support excavation systems. Case study. 1- Retaining walls : 2- Big Boulder Foundations 3- Soil Nailing 4- Solider Pile 5- Sheet piles 6- Freezing.

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Project 2

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#### Presentation Transcript

Prepared by :

En’am Sab’ Elaish

NourKananh

MajdolinYasen

Submitted to:

Sami Al-Hijawe

## Case study

1- Retaining walls:

2- Big Boulder Foundations

3- Soil Nailing

4- Solider Pile

5- Sheet piles

6- Freezing

### Type of excavation support system ( In general)

1- Big Boulder

2-Row of Pile

3- Retaining Wall

Row Pile Design

### Excavation Parameter

Depth=7.5 m

Assumed :

Surcharge load= 10 KN/m2

Water depth =20m

Water density=9.81 KN/m2

Min. fluid density=5 KN/m2

ɣ=19 ɣ'=9

ɸ=30 = ɸ =20

Ka=0.28 Kp=5.74

### Shape of pile

Length=13

Penetration depth=5.5m

Excavation = 7.5

Deflection = 6 cm OK

### Moment

Moment =751 KN/m2

Moment capacity =901.5/.8=1127 ok

Shear =179.9 KN/m

Shear capacity =305.6/0.8=382 KN/m ok

### shear

Retaining Wall Design

### Retaining wall

qall=400kN/m^2 Ka=0.2 Kp=5 ф=40° C=0

ɣ=19 KN/m3 =(2/3)*ɸ=26.7

q1=ɣ*h*k=21*7.51*0.2=31.542KN/m2

q2=kw=0.2*10=2 KN/m2

p1=0.5*q1*h=0.5*31.542*7.51=118.44KN

p2=q2*w=2*7.51=15.02KN

p1+p2=133.46KN

Moverturning=p1(h/3)+p2(h/2)=296.5+7.51=304.01KN

### Check overturning

W=∑Wn=493KNMn=1665KN.M∑=mresistingF.S=mresisting/moverturning1665/304.01=5.5>2….

Presisting/Psliding>or=1.5

psliding=133.46 kN

Presisting=(∑w*friction factor)+(ɣ*h*kp )

=(493*0.5)+(21*1.8*5)=602.5KN

### Check sliding

• = 4.5>1.5 Ok

M = P*e=293.21kN.m

### Chick bearing pressure

KN/m^2

q1

<qallok

KN/m^2

q2

<qallok

1- The two alternatives of protection are goal for the required purpose .

2- The using of piles requires less time Of the excavation

3- The distance between the adjacent piles in the row is recommended to be less than 3*D

4- Piles are recommended to connect on the top y means of a reinforced concrete beam.

Thanks