沉桩效应的差异分析

Difference Analysis of Pile-driven Influence

运用Crisp程序, 对饱和砂土中的打桩效应进行有限元分析。采取线弹性、理想弹塑性两种本构关系以及应力边界条件法、圆柱孔扩张理论两种沉桩过程模拟方式分别进行组合计算, 并对三种计算组合由于不同的本构关系和沉桩过程模拟方式所引起的超孔隙水压力、径向有效应力增量、地面隆起以及桩周土径向位移等沉桩效应的差异进行讨论, 得出一些初步结论。

A finite element analysis on pile-driven influence in saturated sands is carried out with Crisp program. Two constitutive relations(linear elastic model and ideal elastic-plastic model)and two pile-drivien process's simulation modes(stress boundary conditions method and cylindrical cavity expansion theory)are adopted and combined respectively to compute. Moreover, this paper discusses the differences of pile-driven influence such as excess pore water pressure, increment of radial effective stress, land upheaval and radial displacement of sands around the pile, which are caused by different constitutive relation and pile-driven process simulation mode, and draws some conclusions.