Abstract

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Title:: Numerical Simulation Analysis of Influence of Soft Interlayer on Horizontal Displacement of Deep Foundation Pit

Author(s):: ZHOU Yong; ZHANG Kang-kang; Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology

Keywords:: deep foundation pit; soft interlayer; horizontal displacement; cohesion; internal friction angle; pile-prestressed anchor; numerical simulation

Abstract:: Based on a deep foundation pit supporting project, the influence of soft interlayer on the horizontal displacement of foundation pit was studied. The finite element analysis software PLAXIS 2D and Mohr-Coulomb soil constitute model were used to simulate the pile-prestressed anchor support section of the project. The influences of the cohesion, internal friction angle, thickness and embedded depth on the horizontal displacements of the foundation pit were compared and analyzed, and the effect laws of these factors on the horizontal displacement of foundation pit were obtained. The results show that the existence of soft interlayer has great influence on the horizontal displacement of foundation pit; influence of internal friction angle on the horizontal displacement of foundation pit is more obvious than that of cohesion; changes of horizontal displacement of foundation pit caused by cohesion and internal friction angle changing at same time are more than the sum of changes of the single parameter; horizontal displacement of foundation pit increases with thickness of the soft interlayer increasing; the horizontal displacement of foundation pit increases first and then decreases with the increase of embedded depth.