浅埋暗挖车站上穿施工影响的既有隧道变形规律  

Existing tunnel's deformation of superincumbent subway station induced by approaching excavation in shallow depth

作　　者：王剑晨[1] 张顶立[1] 张成平[1] 于富才[1] 

机构地区：[1]北京交通大学城市地下工程教育部重点实验室,北京100044

出　　处：《北京交通大学学报》2014年第1期8-12,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：中央高校基本科研业务费专项资金资助(2012YJS076)

摘　　要：北京地铁5号线东单站近距离垂直上穿既有1号线地铁区间隧道.对既有隧道底板实测位移进行研究,分析受浅埋暗挖车站上穿施工影响的既有隧道变形规律.结果表明：受新建车站上穿施工扰动,既有隧道呈上浮变形且无明显扭转现象;采用Peck公式对既有隧道底板上浮变形进行拟合,结果与实测值较吻合,说明在上穿施工扰动下既有隧道变形与天然地层变形类似,符合Peck曲线变形规律;拟合得到地层损失率为0.034％～0.097％,地表处沉降槽宽度系数值为0.34～0.68.Beijing Metro Line 5 Dongdan station vertically crosses above Line 1 metro tunnels.Analyzing the measured deformation of the existing tunnels structure,we obtain the deformation law of the superincumbent subway existing structure.Research results show that the existing tunnels＇ deformations are rising and non-twisted.The existing tunnels＇ deformation complies with Peck formula,which show it is similar to the deformation of natural stratum.The ground loss ratio fitted by Peck formula is 0.034 ％ ～ 0.097 ％,and the settlement trough width parameter fitted by Peck formula is 0.34～ 0.68.

关 键 词：隧道工程 既有隧道 PECK公式 变形规律 

分 类 号：U231.3[交通运输工程—道路与铁道工程]