基坑开挖对邻近地铁区间影响的数值模拟分析

Numerical Simulation of Foundation Excavation Effect on Adjacent Subway Intervals

临近基坑的地铁轨道会因为基坑的开挖而产生位移和变形,这将影响到轨道交通的运营安全。以长沙某深基坑工程为背景,通过划分不同的施工阶段,用PLAXIS软件模拟分析了在该项目的基坑开挖过程中,邻近地铁区间的土体位移和管片变形的发展规律。结果表明:随着开挖的进行,地层最大竖向位移发生在基坑底部,最大水平位移发生在基坑顶部,地铁隧道处的地层位移变化较小;地铁管片离基坑越近,变形越大。

The adjacent subway track will produce displacements and deformations due to the excavation of the foundation,which affects the safety of the subway in service. Taking the project of a deep foundation in Changsha as the engineering background,through the division of different construction stage,PLAXIS software was used to simulate and analyze the development law of soil displacement and deformation of the adjacent section of the subway during the foundation pit excavation process. The results show that with the excavation,the maximum vertical displacement of the stratum occurs at the bottom of the foundation pit,and the maximum horizontal displacement occurs at the top of the foundation pit. The displacement of the stratum at the subway tunnel changes little. The closer the subway tube is to the foundation pit,the greater the deformation.