地铁车站深基坑开挖对临近建筑物影响的三维有限元分析

Finite element analysis of the influence of deep foundation pit excavation on adjacent buildings in subway station

本文以天津市某地铁车站深基坑工程为例,利用MidasGTS有限元分析软件,开展基于硬化土本构模型的三维有限元数值模拟。研究主要分析了地铁车站深基坑开挖对围护结构和周围土体的变形特性,以及基坑施工对周边临近房屋变形及受力的影响,希望为类似基坑开挖相邻影响的有限元分析提供一些参考。结果表明,基坑施工对邻近房屋受力的影响较小,但对房屋变形具有一定影响,对于结构整体性和抗变形能力相对较差的房屋,需基坑施工过程中严格控制施工质量并加强监测,以保证周边房屋建筑结构安全。

Three-dimensional finite element analysis was carried out by using Midas GTS to simulate a deep foundation pit project of subway station in Tianjin.The hardening-soil model was chosen as soil constitutive model in this numerical simulation.This research mainly analyzed the deformation characteristics of the deep foundation pit and surrounding soil,as well as the influence of the foundation pit construction process on the deformation and force of the adjacent house.It is hoped to provide some references for the FEM analysis of the adjacent effects of similar foundation pit excavation.The results show that the foundation pit construction process has a certain impact on the deformation,instead of the forces of the house.For houses with relatively poor structural integrity and deformation resistance,the construction quality must be strictly controlled,and monitoring should be strengthened during the construction to ensure the safety of adjacent buildings.