隧道下穿既有线的案例分析与沉降分析方法  

Structural settlement of existing tunnel caused by new tunnel excavated underneath

作　　者：韩煊[1] 刘赪炜[1] Jamie RStanding 

机构地区：[1]北京市勘察设计研究院有限公司,北京100038 [2]英国帝国理工学院

出　　处：《土木工程学报》2012年第1期134-141,共8页China Civil Engineering Journal

基　　金：北京市科技新星项目(2005B29);北京市留学人员科技活动择优重点资助项目(200401);北京市优秀人才培养专项经费资助项目(2008F-13)

摘　　要：随着城市地铁建设渐入规模,越来越多的地铁建设将面临多次穿越既有地铁线路的问题,这是新线建设中等级最高的风险工程之一。对这类问题引起的工程风险的合理预测和评估具有重大的工程意义,也是领域内研究的难点,迄今尚未提出有针对性的有效预测和评价方法。基于刚度修正法的基本思路和对实测既有线隧道变形特征的分析,从国内外典型的地铁下穿既有线的案例分析着手,着重考虑既有隧道埋深、结构刚度对其变形特征的影响,从而提出适用于预测既有线在新建隧道下穿影响下产生沉降的简便分析方法,为地铁隧道施工对既有线隧道影响的风险预测及评估提出崭新的思路和工程实用的分析途径。Because of the rapid growth of urban subway system both at home and abroad, a more frequently encountered situation is that the new tunnel needs to pass through existing tunnel （s）, which may cause considerable risk to the existing tunnel structure and the safety of the train. A modified stiffness method is proposed for predicting the structural settlement of existing tunnel caused by new tunnel excavated underneath, based on observations from field monitoring data. Some key factors, such as the depth of the existing tunnels, the structural stiffness, are studied and discussed. The suggested method can be served as a new approach to evaluation of the risk caused by construction of tunnels in urban environment.

关 键 词：隧道 地铁 既有线 地层位移 变形预测 沉降槽 风险分析 

分 类 号：U451[建筑科学—桥梁与隧道工程]