沉桩对周围土体作用的有限元分析

The Study of Pile Driving by FEM Method

在综合分析国内外对沉桩问题研究成果的基础上 ,应用圆柱形空腔体扩张理论模拟沉桩过程 ,考虑土体的本构关系采用较适合粘土地基的修正剑桥模型 ,编制考虑固结效应的空间轴对称有限元程序。对几种不同直径的桩贯入时 ,桩周围土体的应力场 ,位移场和桩周超静孔压分布进行分析研究。

On the basis of comprehensive analysis of the current rsearch achievements of pile driving, this paper adopts a cylindrical cavity expansion to simulate pile driving. Because pile driving usually carries on soft clay foundation, the revised Cambridge yield model that can suit this soil is employed. The axisymmetric Finit Element Method program accordingly is set up for analysing the influence of pile driving. And the results which include the stress field, displacement field and hydrostatic excess pressure around piles of three different diameters driven into clay are are calculated and analysed in this paper.