基坑开挖排桩支护的弹塑性有限元分析

Elastic-plastic FEM Analysis of Brace-excavation

本文对于采用排桩支护的基坑开挖工程利用弹塑性有限元法进行了深入分析。通过对比,我们可以发现有限元法给出的支护桩内力、变形结果与规范方法吻合较好。在文中,我们重点讨论了开挖范围内的应力、应变情况以及作用于支护桩上的土压力分布,并得出了有益的结论。

In the paper, we discuss the design of the braced - excavation based on the result of elastic - plastic FEM analysis. Comparison is carried out between FEM results and those calculated by elastic counterforce method, which is recommended by the design code. It is found that the force and deformation of bearing piles are similar between the two methods. The results of FEM show the status of stress and strain of the braced - excavation area and the distribution of soil pressure on the bearing piles. At last, we make suggestions about the braced - excavation design.