深基坑施工对地铁车站影响的数值仿真分析  

Numerical Simulation and Analysis of Influence of Deep Excavation on Adjacent Subway Station

作　　者：沈辉[1,2] 罗先启[1] 李野[1] 彭波[1] 杨德春[3] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]九江学院,江西九江332005 [3]广州地铁设计研究院有限公司,广州510010

出　　处：《地下空间与工程学报》2011年第5期1018-1023,1028,共7页Chinese Journal of Underground Space and Engineering

摘　　要：随着地铁及城市轻轨交通项目在我国快速兴建,地铁及轻轨沿线土地开发项目迅速增加,而大量新建建筑深基坑工程位于地铁车站和隧道附近或地铁保护范围内,使得地铁车站和隧道不可避免地受到工程建设的影响。本文以临近苏州轨道交通2号线石路站某深基坑工程为背景,运用FLAC3D软件建立三维数值分析模型,对深基坑施工进行数值仿真分析。仿真结果表明:地铁车站最大位移及回弹变形符合控制要求,单侧深基坑开挖引起地铁车站结构刚体位移及结构应力改变,而地铁车站对深基坑开挖产生的土体位移传递具有一定阻碍作用。最后建议对于地铁车站及隧道受临近深基坑工程影响的数值仿真分析,应考虑周边土地开发未来高层规划,综合考虑不同时期多个深基坑工程开挖卸荷及长时间降水对地铁车站或隧道的内力及变形影响。As metro and urban light railway transit projects are rapidly launched in China,land exploitation projects along the railway are increasing too,and lots of new buildings＇ deep foundation pit work are located around metro station and tunnel protection sphere,the metro station will inevitably be influenced by those engineering constructions.Based on a deep excavation project around the metro station in Suzhou,using FLAC3D software 3d numerical analysis model of deep foundation pit excavation,the simulation results show that the maximal displacement and springback deformation of the metro station meets the control requirements.Unilateral deep excavation causes structural stress and displacement change,and metro station produces certain block function at soil mass displacement transfer.Finally,the dissertation suggests for that the numerical simulation analysis about metro station and tunnel near deep excavation,consideration should be given to the surrounding land development plan in future for highrise buildings,the influence of unloading in different period and long time precipitation due to deep excavation on tunnel deformation and internal force of metro station or tunnel.

关 键 词：深基坑 地铁车站 数值仿真分析 

分 类 号：O319.56[理学—一般力学与力学基础]