富水土砂分界地层隧道施工工法研究  

Study on construction method of rich-water tunnel in soil-sand boundary stratum

作　　者：王志杰[1] 李金宜 徐海岩[1] 万俊峰 王成 马云飞 WANG Zhijie;LI Jinyi;XU Haiyan;WAN Junfeng;WANG Cheng;MA Yunfei(Key Laboratory of Traffic Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Haoji Railway Co.,Ltd.,Beijing 100000,China;China Railway Design Corporation,Tianjin 300142,China)

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,四川成都610031 [2]浩吉铁路股份有限公司,北京100000 [3]中国铁路设计集团有限公司,天津300142

出　　处：《铁道科学与工程学报》2021年第10期2660-2670,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51678498);教育部创新团队发展计划资助项目(IRT0955);高铁联合基金资助项目(U1934213)。

摘　　要：在砂质黄土与全风化红砂岩形成的富水土砂分界地层中开挖隧道易出现涌水溜砂、围岩滑塌等现象。为保证隧道安全快速施工,以浩吉铁路阳城隧道为工程依托,采用室内试验、数值模拟、现场监测等研究方法,探究土砂分界地层隧道施工工法适用性。研究结果表明:按照围岩变形从大到小排序,依次为两台阶法、三台阶法、三台阶预留核心土法、CD法、双侧壁导坑法。3种台阶法墙脚处均存在较大应力集中,CD法、双侧壁导坑法施工成本高、进度慢;三台阶预留核心土法较三台阶法能有效减小掌子面挤出。三台阶预留核心土法辅以降水、旋喷桩加固等组合措施,可保证富水土砂分界地层隧道安全快速施工。Tunneling in the boundary stratum of sandy loess and fully weathered red sandstone was prone to the phenomena of inrush sand and sliding behind the wall.In order to ensure the fast and safe construction of the tunnel,this paper,relying on the Yangcheng tunnel of Haoji railway,adopted a variety of methods such as laboratory test,numerical simulation and field monitoring to explore the applicability of different construction methods distributed in soil and sand boundary strata.The following conclusions were drawn from the study.According to the calculation results,the surrounding rock deformation is sorted from large to small,which is followed by step method,three-step method,three-bench excavation and reserved core soil method,CD method,and double side drift method.The stress concentration is large at the foot of wall in the all three kinds of step method.The construction cost of the CD method and the double side drift method is high and the progress is slow.The three-step excavation and reserved core soil method can effectively reduce the palm surface extrusion compared with the three-step method.For the excavation of the soil-sand boundary stratum tunnel,it is recommended to use the three-bench excavation and reserved core soil method supplemented by combined measures such as precipitation and rotary jet pile reinforcement to enable the tunnel to be constructed safely and quickly.

关 键 词：铁路隧道 富水土砂分界地层 施工工法 数值模拟 现场测量 

分 类 号：U25[交通运输工程—道路与铁道工程]