基坑开挖对既有地铁线路位移影响分析

Analysis of the Existing Subway Line’s Displacement Due to Excavation

随着城市地铁干线的大规模修建以及诸多后续地下工程的建设,地下开发对地铁线路的影响成为一个不可避免的问题。尤其基坑开挖对既有地铁的位移影响,更是一个急需深刻认识和解决的问题。应用有限元方法对某工程进行三维建模,通过模拟计算,对基坑开挖引起地铁衬砌截面的最终位移进行总结并加以分析,更加科学的认识基坑开挖对既有地铁线路的位移影响。在认识到基坑开挖对既有地铁作用机理后,整理了地铁衬砌上若干节点位移随施工阶段的变化曲线。并提出若干处理措施。

With the large-scale construction of subway lines,as well as a number of underground constructive works followed,the construction of the underground will influence the subway lines,and this problem has been an unavoidable problem.In particular,the changes of the subway lines displacement due to excavation is also a very popular and much-needed problem to be known and solved.Applying finite element software to upbuild three-dimensional simulation based on a specific project,providing a more scientific understanding of the existing subway lines displacement effects due to excavation.Through the simulation,we can see the subway lining final displacemencaused by the excavation and analyze its causation.This paper also compiled the curves of the displacement changes with the construction phases,thus further know the subway line displacements effects due to excavation.While recognizing the working mechanism of the excavation to the existing lines,this paper concludes with a number of measures to deal with such issues in order to get feedback purposes.