地下连续墙支护结构的深基坑开挖过程分析

Analysis of Deep Foundation Pit Excavation Process of Underground Continuous Wall Support Structure

各类深基坑的破坏一般是由于坑外荷载过大,超过支护结构的承载能力所导致的。因此对基坑支护结构在开挖过程中的变形和内力变化情况进行模拟分析尤显必要。以某地铁车站深基坑为研究对象,利用PLAXIS2D有限元分析软件,对基坑开挖和支护的过程进行模拟分析,分析基坑开挖影响范围、支护结构位移和内力、土体位移等问题,提出控制基坑失稳的方法和建议,为类似的深基坑工程的施工提供参考。

The damage of various types of deep foundation pits is generally caused by the excessive load outside the pit,which exceeds the bearing capacity of the supporting structure. Therefore,it is especially necessary to simulate the deformation and internal force changes of the foundation pit support structure during excavation. In this paper,the deep foundation pit of a subway station is taken as the research object. The PLAXIS2D finite element analysis software is used to simulate the excavation and support process of the foundation pit. The influence range of foundation pit excavation,displacement and internal force of the supporting structure and soil are analyzed. For the problem of body displacement,the method and suggestion for controlling the instability of foundation pit are proposed,which provides reference for the construction of similar deep foundation pit engineering.