打桩效应的有限元分析

通常打桩过程可以看作了圆柱形空腔体的扩张，并且假设扩张是处于平面应变状态，这－假设有明显的缺陷，本文提出用空间轴Ｂｉｏｔ固结有限元法对打桩过程进行模拟，计算结果与实测值较吻俣，说明该方法是有效可行的，在些基础上，、对打桩经起的地面隆起，桩周土的应用力、位移、邻桩应力等问题进行了计算研究，得一些初步的成果。

Finite Element Analysis of Pile Driving Effect

The process of pile-driving is often modelled as cylindrical cavity expansion. In addition, it is ususally assumed that the expansion occurs under plane strain. Some defects obviously exist in this method. A space axial symmetry FEM with Blot's consolidation theory is suggested to simulate the process of pile-driving. This numerical technique is valid because calculation results agree with field data. Calculation results are also reported of the ground heave, stress and deformation of soil around the pile, and the effect on neighbouring piles and some conclusions are obtained.