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《Chinese Journal of Underground Space and Engineering》 2011-04
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Earth Pressure and Displacement of Combined Retaining Structures from Piles plus Soil Nailing Walls

Yang Yuwen,Xiao Jianhua(Wuhan Geotechnical Engineering and Surveying Institute,Wuhan 430022,China)  
The structures formed from soil nailing walls and piles are the new earth-retained walls developed recently in deep excavations.The upper soil nailing walls work together with lower piles as a whole to retain soil.Earth pressure and displacement for the combined supporting structures are thus different with either soil nailing walls or piles.Based on case history in Wuhan,the earth pressures and displacements are investigated using 3D numerical simulation experiments.For the combined structures,analytical results have indicated that(1) actual earth pressures are different from those determined by classical Rankine theory.Coefficients are given to correct the values from Rankine theory.Passive earth pressure increases by about 20% in comparison with that for piles while the maximum earth pressure for soil nailing walls decreases by about 50%;(2) the maximum lateral displacements are associated with the coefficients of integrality stiffness proposed in this study.Under similar geological conditions,as the coefficient increases from 4000 to 5000,the maximum lateral displacement is found to decrease remarkably.
【CateGory Index】: TU753
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