上海自然博物馆基坑地下连续墙变形研究

新建上海自然博物馆基坑工程为深大异形坑中坑工程,周围环境复杂,施工风险大.利用三维有限元模拟方法,计算内外坑开挖过程中外坑地下连续墙的变形,选取模型中内外坑地下连续墙5种不同间距处的计算结果与现场监测数据对比,得出内外坑连续墙间距小于20m时外坑连续墙最大水平位移随内外坑间距增大而增大,但当内外坑地连墙间距大于20m时,内外坑地连墙间距变化对外坑连续墙最大水平位移影响不大；该工程坑中坑内坑开挖对外坑地连墙水平变形影响较小.

A Research on the Deformation of Continuous Wall in the Foundation Pit of Shanghai Natural History Museum

The foundation pit project of newly built Shanghai Natural Museum is a project of irregular deep-pit excavation,with complex surrounding environment and great construction risk.Using three-dimensional finite element simulation method,deformation of the external pit underground continuous walls is calculated in the process of internal and external pit excavation.Calculation results of five different spacing of internal and external pit of underground continuous walls in the model are selected to make a comparison with on-the-spot monitoring data.The result is that the maximum horizontal displacement,when the distance between the pit wall of the internal and external pit continuous walls is less than 20m,will increase with the increasing distance between the internal and external pit.However,when the the distance between the internal and external pit continuous walls is more than 20m,the effect of maximum horizontal displacement is little,pit-in-pit excavation in this project has little influence on deformation of external pit continuous walls.