炭质围岩地层三线大跨隧道出口段支护设计

Research on the Support Design of the Exit Section of a Three-Lane Large-Cross Section Tunnel in the Carbonaceous Rock Formation

以新建铁路玉溪至磨憨线王岗山隧道出口段为工程背景,通过现场实测数据分析炭质围岩地层中三线大跨隧道围岩及衬砌结构大变形情况及其产生原因,提出优化隧道支护设计及施工方案,为有效解决炭质围岩中软岩大变形问题提供参考。

Taking the exit section of Wanggangshan tunnel,located in the newly-built railway line from Yuxi to Mohan,as the background,the large deformation characteristic of the surrounding rock and lining structure of a third-lane large-cross section tunnel in carbonaceous rock stratum was analyzed based on the in-situ measured data.The reasons of the tunnel deformation were investigated,and the optimized tunnel support andconstruction plan were proposed.