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Innovative Excavation Support Systems in Palestine: Case Study on Retaining Walls & Foundations

This project, prepared by En’am Sab, Elaish Nour, Kananh, and Majdolin Yasen, examines various excavation support systems used in Palestine, including retaining walls, big boulder foundations, soil nailing, soldier piles, and sheet piles. The study focuses on a case involving a 7.5 m deep excavation with specific soil properties and design parameters. The analysis covers critical factors such as moment, shear capacities, overturning checks, and sliding stability, leading to conclusions on effective excavation methodologies and recommended practices for optimal protection measures.

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Innovative Excavation Support Systems in Palestine: Case Study on Retaining Walls & Foundations

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  1. Prepared by : En’am Sab’ Elaish NourKananh MajdolinYasen Submitted to: Sami Al-Hijawe Project 2

  2. Support excavation systems

  3. Case study

  4. 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)

  5. 1- Big Boulder 2-Row of Pile 3- Retaining Wall The most commonly used methods in Palestine are:

  6. Row Pile Design

  7. 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

  8. Section parameter

  9. ɣ=19 ɣ'=9 ɸ=30 = ɸ =20 Ka=0.28 Kp=5.74 Soil properties

  10. Shape of pile Length=13 Penetration depth=5.5m Excavation = 7.5

  11. Deflection = 6 cm OK Deflection

  12. Moment Moment =751 KN/m2 Moment capacity =901.5/.8=1127 ok

  13. Shear =179.9 KN/m Shear capacity =305.6/0.8=382 KN/m ok shear

  14. Retaining Wall Design

  15. Retaining wall

  16. 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

  17. 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….

  18. 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

  19. M = P*e=293.21kN.m Chick bearing pressure KN/m^2 q1 <qallok KN/m^2 q2 <qallok

  20. 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 :

  21. Thanks

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