西藏米拉山隧道围岩大变形成因分析  

Analysis on the Causes of the Large Deformation of Surrounding Rocks of Milashan Tunnel in Tibet

作　　者：吴树元[1] 程勇[1] 谢全敏[2] 刘继国[1] 陈必光[1] WU Shuyuan;CHENG Yong;XIE Quanmin;LIU Jiguo;CHEN Biguang(CCCC Second Highway Consultants Co.Ltd.,Wuhan 430056;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056 [2]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《现代隧道技术》2019年第4期69-73,共5页Modern Tunnelling Technology

基　　金：西藏自治区重点科研项目(2016XZ01G31);国家自然科学基金项目(50874085)

摘　　要：隧道围岩大变形是隧道施工中的一个极其复杂难题。文章以西藏米拉山隧道围岩大变形为研究对象,通过现场调查与试验分析对大变形成因进行了研究,结果表明:米拉山隧道凝灰岩抗风化能力差和遇水易软化是围岩大变形的根本原因,而施工工艺不当是围岩大变形的重要诱因。基于米拉山隧道大变形成因分析,文章提出了米拉山隧道大变形处治方案和控制措施。Large deformation of tunnel surrounding rocks is a sophisticated problem during tunnel construction.Taking the large deformation of surrounding rocks of Milashan tunnel in Tibet for example,the causes of large deformation were studied by site investigation and experimental analysis.The results show that properties of tuff such as poor weather resistance and softening upon meeting water are the two radical reasons of large deformation,and improper construction technology is a main inducement.A treatment scheme and control measures were proposed based on an analysis of causes of large deformation of Milashan tunnel.

关 键 词：米拉山隧道 凝灰岩 围岩大变形 形成机理 灾害控制 

分 类 号：U458.1[建筑科学—桥梁与隧道工程]