复杂边界条件下地铁车站超深基坑开挖方案研究

Research on Metro Station Super Deep Foundation Pit Excavation under Complex Boundary Conditions

在城市轨道交通工程建设过程中,不可避免地会有大量的超深、超大基坑工程紧邻风景名胜区、河道及既有建构筑物等重要风险源。采用有限元分析软件MIDAS/GTS对同期设计、建设的南通轨道交通2号线体育公园站和地块开发项目的基坑开挖方案(合坑开挖、分坑开挖)进行了围护结构变形测算以及周边环境影响分析比选。结合工程自身特点及实际情况,最终确定了综合风险最低的分坑开挖实施方案。

In the rapid development of urban rail transit construction,many important risk sources such as the large number of super deep and large foundation pit projects close to scenic spots,rivers and existing buildings will certainly emerge.In this paper,the finite element analysis software MIDAS/GTS is used to calculate the deformation of enclosure structure and analyze the influence of surrounding environment for the designed and constructed Sports Park Station on Nantong rail transit Line 2,and the foundation pit excavation in a plot development project in the same period,the latter adopts combined pit excavation and separate pit excavation.Combined with the characteristics and actual situation of the projects,the implementation scheme of separate pit excavation is finally determined which has the lowest comprehensive risk.