基坑开挖卸荷对下方既有地铁隧道影响的数值仿真分析  

Numerical simulation and analysis of effect of excavation of foundation pits on metro tunnels

作　　者：张玉成[1,2,3] 杨光华[1,2] 姚捷[1] 刘鹏[1,4] 李德吉[2] 乔有梁[2] 

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]广东省水利水电科学研究院,广东广州510610 [3]中国建筑第三工程局有限公司,湖北武汉430070 [4]广州市水利水电勘测设计研究院,广东广州5106401

出　　处：《岩土工程学报》2010年第S1期109-115,共7页Chinese Journal of Geotechnical Engineering

摘　　要：海珠广场发展项目基坑工程位于地铁隧道的正上方,坑底距隧道顶的最小距离仅为5 m。基坑开挖对该地铁区间隧道影响的分析与计算成为该工程的关键之一。为此建立了该基坑工程的数值分析模型,计算结果表明,基坑开挖对开挖面以下土体具有显著的垂直方向卸荷作用,不可避免地引起坑底土体发生变位,带动土体中的隧道产生位移,同时隧道管片的应力状态也有所改变。其成果可为优化设计和施工提供有益的参考,为类似工程提供借鉴。The foundation pit of Haizhu Square in Guangzhou is located above the metro tunnel.The minimum distance between the bottom of foundation pit and tunnel top is just 5 m.The key of the foundation pit project is know how the excavation of the foundation pit affect the metro tunnel.A numerical model for the foundation pit project is established.The results show that the excavation below the soil surface has a significant role in the unloading along the vertical direction,and it inevitably leads to occurrence of soil deformation at the bottom of the pit,causing the tunnel displacement.The stress state of the tunnel segment also changes.The results provide valuable reference to the project design and construction.It is helpful to other similar projects.

关 键 词：基坑 开挖 卸荷模量 地铁隧道 数值仿真 

分 类 号：TU470[建筑科学—结构工程]