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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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Prepared by : En’am Sab’ Elaish NourKananh MajdolinYasen Submitted to: Sami Al-Hijawe Project 2
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 The most commonly used methods in Palestine are:
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 Soil properties
Shape of pile Length=13 Penetration depth=5.5m Excavation = 7.5
Deflection = 6 cm OK Deflection
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
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….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. the following conclusions can be made :