深基坑施工对毗邻地铁的影响研究

Study on Influence of Deep Foundation Pit Construction on Adjacent Subway

深基坑开挖过程中卸荷量大,使得土体的变形场与应力场发生较大变化,极易引起地铁管片的开裂与渗漏水等危害现象,影响地铁正常运营。采用数值模拟的方法,在研究了某超大基坑开挖的全过程的基础上,通过对支护体系的内力分析与变形分析,评估该基坑施工过程中对周围环境的影响,尤其是对地铁隧道的影响,为基坑支护的设计提供依据,也为深基坑施工提供参考。

The large amount of unloading in the process of deep foundation pit excavation makes great changes in the deformation field and stress field of soil,which is very easy to cause harmful phenomena such as subway segment cracking and water leakage,and affect the normal operation of subway.Using the method of numerical simulation,based on the study of the whole process of the excavation of a super large foundation pit,through the internal force analysis and deformation analysis of the support system,evaluate the impact of the foundation pit construction on the surrounding environment,especially on the subway tunnel,to provide a basis for the design of foundation pit support and a reference for the construction of deep foundation pit.