SMW围护结构用于地铁车站深基坑变形实测分析  

Survey Analysis of the Deformation of SMW Retaining Structure in Deep Foundation Excavation of Subway Station

作　　者：夏江涛[1] 沈亚[2] 龚成中[1] 刘泽俊[1] 

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001 [2]淮安市城市建设设计研究院有限公司,江苏淮安223001

出　　处：《施工技术》2014年第19期13-16,共4页Construction Technology

基　　金：江苏省自然科学基金项目(No.BK2011406)

摘　　要：依托南京地铁1号线某基坑工程,实测分析了围护结构深层土体水平位移、钢支撑轴力、周边地表沉降等随土方开挖、支撑设置等因素变化的规律。实测结果分析表明,围护墙最大位移位置随着开挖的进行逐渐下移,但基本在基坑开挖面以上,位于基坑深度约3/4处;基坑开挖深度较浅时,支撑轴力基本维持不变或变化缓慢,随着土方开挖,相应位置处钢支撑轴力也随之增大,垫层浇筑完成后,支撑轴力基本趋于平稳;周边地表沉降具有较明显的沉降快速发展阶段、缓慢下沉阶段和逐渐稳定3个阶段,在基坑垫层尤其是底板浇筑后,周边地表沉降趋于稳定,其变化规律和围护结构水平位移、支撑轴力变化趋势相同。Based on some foundation excavation engineering of Nanjing Subway Line 1 , this paper analyzes change rule of horizontal displacement of deep soil of SMW retaining structure, strut axial forces, ground settlement around foundation excavation and so on with earthwork excavation and support set by site monitoring. The measured results show that the position of maximum displacement of SMW wall gradually shift down with the excavation, but it is above excavation surface basically and in about three-fourths of the foundation excavation depth. Strut axial forces are essentially unchanged or change slowly when the excavation depth is shallow. Steel strut axial forces of the corresponding position increase with excavation of the foundation excavation. Support axial forces tend to be stable after pouring cushion. Ground settlement around foundation excavation has three phases obviously. They are rapid development stage, slow subsidence stage and gradual stable stage. The change trend of ground settlement around foundation excavation is the same to displacement of deep soil of SMW wall and strut axial forces.

关 键 词：地下工程 深基坑 地铁 SMW围护结构 监测 变形 

分 类 号：U231.3[交通运输工程—道路与铁道工程]