西南交通大学学报2017，Vol.52Issue(5)：910-918,9.DOI:10.3969/j.issn.0258-2724.2017.05.010
基坑近接既有地铁盾构隧道施工影响分区方法
Impact of Partition Method in Pit Construction Adjacent to Existing Metro Shield Tunnel
摘要
Abstract
In order to ensure the structural safety and normal operation of pit construction occurring adjacent to an existing metro shield tunnel,research on a longitudinal equivalent rigidity model of a shield tunnel was performed to establish the relationship between the tunnel's longitudinal deformation curvature and the bolt's bearing condition,and to set the requirements for a normal operation of the track. Subsequently,the actual engineering conditions of a particular deep-large pit in Shenyang, which is adjacent to an existing subway shield tunnel,were used to create a three-dimensional numerical analog. By changing the spatial position of the newly constructed pit near the existing shield tunnel with pile-anchor support,zoning charts were drawn and divided into zones of strong,weak,or no influence. Settlement measured in the field confirmed the efficiency of zoning standards based on influence and control technology. The results show that the longitudinal deformation curvature of the shield tunnel is the key index for determining the safety and normal operation of pit construction adjacent to the existing metro shield tunnel. Consequently,the tunnel 's longitudinal deformation curvature can be used as a zoning standard for the influence of the adjacent subway shield tunnel. Finally,the critical state of the track alignment and the longitudinal deformation curvature of the tunnel joint within the limit state can be used to define the thresholds for zoning charts divided into zones of strong,weak,and no influence.关键词
基坑/盾构隧道/曲率半径/近接施工/影响分区Key words
pit/shield tunnel/radius of curvature/adjacent construction/influence partition分类
交通工程引用本文复制引用
郑余朝,施博文,孙克国,杨天春,李辉..基坑近接既有地铁盾构隧道施工影响分区方法[J].西南交通大学学报,2017,52(5):910-918,9.基金项目
国家自然科学基金资助项目(51678494,51678495) （51678494,51678495）
中央高校基本科研业务费专项资金资助项目(SWJTU11ZT33) （SWJTU11ZT33）
