上海轨道交通超深基坑三维数值模拟分析

摘要

利用FLAC3D有限差分法分析软件,针对上海轨道交通某开挖深度为24.3 m的超深长条形基坑建模计算,考虑土体、围护结构、水平支撑体系共同作用,分别计算模拟了三种不同开挖方式,并与实测数据进行比较,得出了该类超深基坑的变形特点,基于此提出了变形控制要点,为超深基坑的设计优化和变形预测提供了依据。%The study adopts the FLAC3D,the finite difference method analyzing software,considers the common roles of the soil,the enclosure structure,and the horizontal support system according to the modeling calculation for the super-deep and long strip foundation pit with the depth of 24.3 meters of some excavation in Shanghai Rail Traffic,simulates the three different excavation methods,compares them with the field data,concludes the deformation features of the deep foundation pits,and points out the deformation controlling points based on the previous point,so as to provide the reference for the design optimization and the deformation forecasting of the design for the super-deep foundation pits.