PROJECT 2

Prepared by: En’am Sab’ Elaish

Nour KananhMajdolin Yasen

Submitted to:Sami Al-Hijawe

SUPPORT EXCAVATION SYSTEMS

CASE STUDY

TYPE OF EXCAVATION SUPPORT SYSTEM ( IN GENERAL)

1 -Retaining walls :2 -Big Boulder Foundations

3 -Soil Nailing4 -Solider Pile5 -Sheet piles

6 -Freezing

THE MOST COMMONLY USED METHODS IN PALESTINE ARE:

1 -Big Boulder2-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

SECTION PARAMETER

 

SOIL PROPERTIES

ɣ=19 ɣ'=9ɸ=30 = ɸ =20Ka=0.28 Kp=5.74

SHAPE OF PILE

Length=13Penetration depth=5.5mExcavation = 7.5

DEFLECTION

Deflection = 6 cm OK

MOMENT

Moment =751 KN/m2

Moment capacity =901.5/.8=1127 ok

SHEAR

Shear =179.9 KN/m

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

Retaining Wall Design

RETAINING WALL

CHECK OVERTURNING

qall=400kN/m^2 Ka=0.2 Kp=5 ф=40° C=0ɣ=19 KN/m3 =(2/3)*ɸ=26.7q1=ɣ*h*k=21*7.51*0.2=31.542KN/m2q2=kw=0.2*10=2 KN/m2p1=0.5*q1*h=0.5*31.542*7.51=118.44KNp2=q2*w=2*7.51=15.02KNp1+p2=133.46KN

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

W=∑Wn=493KNMn=1665KN.M∑=mresisting

F.S=mresisting/moverturning

1665/304.01=5.5>2.…

weight(kN) arm(m) moment(KN.m)

W1=.5*.4*6.71*25=3

35.5

(.4/3)+.3+1.3=1.733

581.4

W2=6.71*.3*25=50.3

25

(.3/2)+1.3=1.45 73

W3= 4*.8*25=80 2 160

W4=.5*.4*6.71*21=2

8.2

1.6+(2/3)*.4=1.9 53.6

W5=2*6.71*21=281.

8

3 845.4

W6=1.3*1*21=27.3 1.3/2 17.75

W7=10*2.4=24 2.8 6.72

CHECK SLIDING

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

=4.5 >1.5 Ok

M = P*e=293.21kN.m

CHICK BEARING PRESSURE

q1

q2

<qall ok

<qall ok

KN/m^2

KN/m^2

THE FOLLOWING CONCLUSIONS CAN BE MADE:

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