软土地基基坑工程有限元分析

Analysis of Foundation Pit in Soft Soil with FEM

软土地基基坑工程的稳定性至关重要,直接影响着基坑本身及其周围环境的安全,基坑土体和支护结构的变形及受力情况是判断其稳定性的重要指标,而传统的计算方法不能对这些指标同时进行计算。本文采用有限元方法,结合实际基坑工程,将基坑工程简化为二维模型进行分析,采用不同的材料模型模拟基坑的不同部分,选择合理的计算参数,分工况模拟基坑开挖的实际施工过程,计算各种工况结束时土体和支护结构的变形及内力,得出支护结构水平位移的计算结果与实测值吻合较好,表明有限元方法能够较好地分析软土地基基坑工程,得到的计算结果比较可靠。

The stability of foundation pit in soft soil influences directly the security of the foundation pit,surrounding structures and buildings. The deformation and stress in soil and shoring structure of foundation pit are important indexes of the stability. In this paper,one practical project is simulated with two-dimensional finite element model. The different structures of the foundation pit are simulated with different material models. Reasonable parameters for calculating are chosen. And the deformation and stress in soil and structures are calculated. The calculated results of shoring wall deflection agree well with the observed data. It shows that the FEM fits for analyzing foundation pit in soft soil and the result is reliable.