沉桩挤土作用的有限元分析

Finite element method for compaction effect of soil on jacked pile

进行了沉桩挤土效应的有限元计算 ,考虑到桩周土体由于桩体贯入引起的挤土效应 ,选用了修正剑桥模型作为土体本构模型 ,通过相应的试验 ,拟合出挤土作用对土体初始弹性模量影响的计算公式 ,确定了土体本构模型参数和其他相关的计算分析参数 ,对 2个试验进行了分析计算 ,结果表明

Compaction effect from jacked pile is calculated by finite element method. Compaction effect of soil surrounding pile is taken into account. Modified cam-clay model is adopted as constitutive model of soil. A formula of initial tangent modulus of soil with compaction effect is presented. And the model parameters and other calculation parameters are determined by test. Finite element method is applied to calculation for a centrifuge model test and another model test. Computed results show that for analysis of stress and displacement in soil around pile, it is necessary to take plastic characteristics of soil and compaction effect into account.