低地应力区地下洞室围岩变形破坏基本类型及其特征研究

Basic deformation and failure types of surrounding rockmass of underground excavation in the low ground stress region

本文以西北地区某市水利工程为例,对低地应力状态下洞室围岩变形破坏类型及其特征进行了研究,提出了低地应力区洞室围岩变形破坏的三种基本类型,即洞顶自重掉落石块型、拱顶横向拉张塌落型和侧壁切向挤压滑落型。这对进一步研究低地应力状态下洞室围岩变形破坏机理,以及围岩稳定治理方案的实施具有理论价值和实际意义。

This paper has studied deformation and failure types of the underground excavation surrounding rockmass in low ground stress state, based on a hydraulic engineering nearby a city in Northwest China. And 3 types are put forward: gravity fall, tension collapse and extrusion press slide. It's useful not only to study its failure mechanism further, but also to define engineering measures which is suitable for surrounding rock mass.