Abstract

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Title:: Analysis of Lateral Force and Displacement for Passive Piles Under Surcharge Load

Author(s):: SONG Xiu-guang; LI Xin; WAN Li-yao; ZHANG Hong-bo; MA Yuan; School of Civil Engineering, Shandong University

Keywords:: lateral surcharge load; passive pile; lateral soil pressure; deflection differential equation; stability analysis

Abstract:: According to the problem of pile deviation or flexural deformation, even cracking and breaking under large lateral surcharge load, which caused large structural safety risk for pile structure. Based on the Flamant solution, the formula of lateral additional stress under the strip load was obtained. Considering the shear effect of interface between the pile and the soil, the two-arameter foundation model was applied to analyze pile-soil force of soil behind the passive pile. The flexural differential equation of passive pile was established, and the internal force and deformation of piles were obtained by MATLAB. The reasonableness of the formula was verified by the unbalance load test data in the literature. The study results show that the effect of surcharge load on lateral earth pressure on the pile is mainly distributed in the upper part of pile, the lateral earth pressure is accounted 86% of the total pile lateral soil pressure. With the increase of loading height, lateral earth pressure, lateral displacement and bending moment of pile show an increasing trend. The conclusions can provide a theoretical basis for the safety evaluation of similar projects.