（中交一公局第三工程有限公司， 北京 100000）

［摘要］结合重庆轨道交通环线凤鸣山站-上桥站区间TBM施工隧道工程，采用现场监测与ANSYS有限元数值模拟的计算方法，针对后行隧道施工对先行隧道的受力及其变形的影响进行分析。研究表明，在双线平行隧道施工时，后行隧道施工会对先行隧道造成挤压的作用，导致隧道管片横向变形减小，环向内力改变；并且通过改变双线平行隧道的间距，认为在砂岩（4级围岩）情况下，隧道净间距超过6.6m （1D）时，施工相互影响较弱，可以不进行加固。

［关键词］地铁隧道； 盾构法； 小间距； 有限元分析

中图分类号： TU45 文献标识码： A文章编号：  1002-848X(2016)S2-0604-05

Influence analysis on parallel tunnel with small spaced of TBM construction

Sun Heming， Fan Dedong， Hu Xipeng， Wang Wenguang， Hu Linhao

（The Third Engineering Co., Ltd. of the First Highway Engineering Bureau of CCCC, Beijing 100000, China）

Abstract: Based on the project of two shield tunnels between Fengmingshan station and Shangqiao station of Chongqing rail transit link, monitoring and ANSYS finite element numerical simulation were used to analyze  influence of the latter shield tunnel construction on internal force and deformation of the front tunnel . Studies have shown that in parallel tunnel construction the latter tunnel construction may press the front tunnel and cause internal force change of front tunnel; and by changing the parallel tunnel spacing construction interaction is weak when tunnel spacing is greater than 6.6m (1D) in sandstone (4 grade rock).

Keywords: metro tunnel; shield method; small spacing; finite element analysis