三层衬砌在高应力软岩隧道支护中的应用研究

摘要

以罗家隧道高应力软岩为例，对隧道衬砌支护进行了探讨。采用三层衬砌设计，一方面允许围岩产生一定变形，增大变形释放掉的围岩压力；另一方面提供较大的支护力，防止围岩产生大变形，保证隧道衬砌结构的安全。数值计算及现场监控数据表明，三层衬砌设计合理，对类似工程有一定借鉴意义。%The Luojia tunnel of soft rock under high stress was taken as an example in the discussion of lining support scheme for tunnels. A design of three⁃lining structure was adopted to not only release the pressure by properly increasing a certain of deformation of surrounding rock, but also provide greater supporting force to stop further and greater deformation. The calculated value and on⁃site monitoring data all indicated that such three⁃lining structure design being reasonable, can provide the reference for other similar projects.