浅埋偏压双侧近接隧道影响分区及对策研究  

Research on the Impact Zoning and Construction Countermeasures for Bilateral Adjacent Tunnels with Shallow Depth and Unsymmetrical Load

作　　者：王志杰[1] 李金宜 蒋新政 李振[1] 曾青 王宁 WANG Zhijie;LI Jinyi;JIANG Xinzheng;LI Zhen;ZENG Qing;WANG Ning(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031;China Railway Design Corporation,Tianjin 300142)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中国铁路设计集团有限公司,天津300142

出　　处：《现代隧道技术》2021年第4期1-11,共11页Modern Tunnelling Technology

基　　金：中国铁路总公司科技研究开发计划课题(2017G007-E);中央高校基本科研业务专项资金(SWJTU11ZT33);教育部科研创新团队发展计划(IR0955).

摘　　要：新建隧道施工会引起围岩应力重分布,从而对邻近既有隧道产生较大的影响。文章依托浦梅铁路新建武调1号隧道和武调隧道双侧近接向莆铁路既有武调隧道工程,采用理论研究的方法建立了适用于双侧近接既有隧道影响度的表达式,得到了基于结构位移准则和结构可靠度准则的两种近接影响分区。通过数值模拟、回归计算的方法完成了两种双侧近接影响分区,结果表明:相比基于结构可靠度准则的近接影响分区,基于结构位移准则的近接影响分区方法中强影响区范围较小,弱影响区范围较大。对处于不同影响分区的既有隧道、新建隧道、中间土体提出了对应的适用于依托工程的施工对策。在不同影响分区范围内,对既有隧道结构位移、衬砌应力进行监测。监测结果显示:当采取既定的施工对策后,既有隧道结构位移、衬砌应力均得到了很好的控制,既有隧道受左侧新建偏压隧道的影响大于右侧新建隧道。The construction of new tunnels can cause a redistribution of stresses in the surrounding rocks,which may pose a great impact on the adjacent existing tunnels.Based on the new Wudiao No.1 tunnel and Wudiao tunnel on the Pucheng-Meizhou railway,which approaches both the right and left sides of the existing Wudiao tunnel on the Xiangtang-Putian railway,this paper conducts a theoretical research,establishes an expression suitable for the impact degree on existing tunnel caused by construction of bilateral adjacent tunnels,and obtains two types of adja⁃cent impact zoning based on the structural displacement criterion and the structural reliability criterion.By means of numerical simulation and regression calculation,two types of bilateral adjacent impact zoning are determined.And the results show that,compared to the adjacent impact zoning based on the structural reliability criterion,the adja⁃cent impact zoning method based on the structural displacement criterion has a smaller range of strong impact zone and a larger range of weak impact zone.Corresponding construction countermeasures for the existing tunnel,new tunnels and intermediate soil pillars in different impact zones are put forward.Structural displacements and lining stresses in existing tunnel are monitored within the different impact zones.And the monitoring results show that when the suggested construction countermeasures are taken,the structural displacements and lining stresses in the existing tunnel could be well controlled,which is more affected by the new unsymmetrical loading tunnel on the left than by the new tunnel on the right.

关 键 词：铁路隧道 浅埋偏压 双侧近接施工 影响分区 施工对策 现场量测 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]