特殊地质隧道初支变形侵限的拆换技术  

Removable Technology of Early Support in Special Geological Tunnel

作　　者：寇新忠[1] 夏龙[1] 

机构地区：[1]中铁一局集团第五工程有限公司,宝鸡721006

出　　处：《北方交通》2013年第3期93-96,共4页Northern Communications

摘　　要：针对特殊地质(高地应力或地应力分布极不均衡、围岩具有膨胀性或挤压性、围岩为松散砂层或软塑土层等)的隧道工程,即使设计采用了较强支护形式,施工预留了一定的变形空间,但初支仍有可能遭到严重的变形破坏导致侵限。为了保证二次衬砌的设计厚度,必须对已变形并侵限的初支进行拆换处理。通过工程实践对变形侵限的初支拆换施工进行了总结,就初支和围岩前期加固、拆换方法以及施工注意事项进行介绍,供类似工程参考或借鉴。For the special geological structure （such as： Highland stress or ground stress distribution is extremely uneven, the surrounding rock with expansive or squeeze the surrounding rock tunnel project for loose sands or soft plastic soil, etc. ）, even if the design uses a strongthe form of support, during the construction period set aside a certain deformation space, but initial support may still be subjected to severe deformation and failure led to intrude limit. In order to ensure the thickness of the secondary lining the design must be deformed and invasion limit the initial support nursing replaceable processing. Intrude limit deformation by engineering practice early support replaceable construction summary of the initial support and surrounding rock pre reinforcement the Removable methods, and construction considerations are introduced, and a reference for similar projects.

关 键 词：挤压性 膨胀性 软岩 隧道 初支 变形 侵限 拆换 

分 类 号：U455[建筑科学—桥梁与隧道工程]