地铁深基坑变形特性有限元模拟及监测分析

Finite Element Simulation and Monitoring Analysis of Deformation Characteristics of a Subway Deep Excavation

为明确地铁车站深基坑开挖变形特性,以某地铁车站的深基坑作为研究对象,并现场监测深基坑施工过程中支护结构的变形,重点分析墙身水平位移、钢支撑轴力随基坑开挖的变化规律。建立有限元模型,对基坑施工过程进行数值模拟计算,并将计算结果与现场监测进行对比分析。发现钢支撑的设置对地连墙的侧向变形有较好的限制作用;有限元数值计算结果与现场实测数据变化规律比较一致;墙身水平位移表现出明显的非线性增长,且墙身位移在其1/2的位置出现最大值。

In order to clarify the deformation characteristics of the deep excavation of the subway station,the deep excavation of a large subway station is taken as the research background. The deformation of the retaining structure during the construction of the deep excavation of the subway is monitored on site,and the horizontal displacement and steel support of the wall are analyzed. The variation of axial force with excavation. The finite element model is established,and the numerical simulation of the foundation pit construction process is carried out. The calculation results are compared with the onsite monitoring. It is found that the steel support setting has a better limiting effect on the lateral deformation of the ground joint wall. The numerical value calculation results are consistent with the change law of in-situ monitor results. The horizontal displacement of the wall body shows obvious nonlinear growth,and the wall body is at its 1/2 position,and the displacement has the maximum value.