竖向载荷作用下单桩接触面性能分析

Performance analysis of single pile-soil interface under vertical load

在桩与土界面处设置Goodman接触单元来模拟桩与土的滑移变形和开裂,建立了单桩在竖向载荷作用下接触面应力和位移的关系公式。用三维有限元的方法,考虑了土体的非线性(Drucker-Prager模型)力学性能,对模型桩进行了模拟计算分析,详细讨论了双曲线接触面本构关系的初始切向、法向刚度对桩顶位移及地表沉降的影响。对理论分析桩的载荷沉降提供了一种有益的参考。

Goodman contact element is proposed for pile-soil interface to represent slippage and pile-soil separation, which can be used to determine the relationship between stress and strain of pile under vertical load. The response of a single pile is analyzed using three-dimensional finite element analysis with the consideration of soil nonlinear behavior （Drucker-Prager model）. A hyperbolic constitutive model of interface is put forward and the influence of initial tangent and normal stiffness on the settlement of pile and surface is discussed, which can provide a valuable reference to the theoretical analysis of load-induced pile settlement.