低地应力区地下洞室围岩压力计算方法及应用

以西北某市水利工程地下洞室泄洪洞等为例,对低地应力区地下洞室围岩压力计算方法与应用进行了研究。研究认为,低地应力区地下洞室围岩压力可分为拱顶横向拉张塌落型、侧壁切向挤压滑落型和洞周自重掉落石块型三种破坏类型产生的围岩压力,并讨论了低地应力区地下洞室围岩压力的计算公式。以研究区引水洞为例,分别计算了拱顶围岩整体滑落和侧壁围岩整体滑落型围岩压力。该项研究成果,它将有利于进一步研究低地应力区洞室围岩稳定性与相应稳定性措施的实施,有助于工程的顺利进行。

Discussion on calculating method and application of surrounding rockmass pressure of underground excavation in the low ground stress region

This paper studied on surrounding rockmass pressure calculating method and application of underground excavation in the low ground stress region, on the basis of one hydraulic engineering in Northwest China. The studying results show that three types of surrounding rockmass pressure were put out,they are tension collapse, extrusion press slide types and gravity fall surrounding rockmass pressure, and then calculating formula have been discussed. At the meantime, surrounding rockmass pressure of tension collapse and extrusion press slide types have been calculated, by one diversion excavation engineering is taken as an example. It's not only better to further study surrounding rockmass stability, but also useful to define engineering measures which is suitable for surrounding rock mass stability.