某砖厂附近山体滑坡成因机制分析及稳定性评价

Formation mechanism analysis and stability evaluation to the landslide near one brickyard

滑坡位于四川成都龙泉驿区,因修建厂房开挖山体形成陡坡,在暴雨作用下,表层松动岩体沿下覆泥岩顶面产生整体高位滑坡,威胁下方厂房及工人生命安全。通过现场地质调查表明,滑坡边界条件及坡体地裂缝展布受早期构造结构面控制,通过地质力学分析该滑坡侧缘、底面边界分别受两组剪性结构面、一组张性结构面和层面控制。滑坡表面宏观变形迹象明显,通过野外定性判断和计算分析表明滑坡天然工况下处于欠稳定状态,暴雨、地震工况处于不稳定状态,提出清除表层松动岩体辅以地表截排水的治理建议。采用的地表变形迹象与结构面地质力学配套分析方法,对于确定类似岩石滑坡边界条件、成因机制分析和稳定性评价具有借鉴意义。

The landslide is located in Longquan District,Chengdu,Sichuan province.For the construction of a factory,the mountain was cut to a steep slope.Under the heavy rain,the loosened rock mass slide over the overlying mudstone surface has formed a high landslide,which will threat the factory and the safety of workers at the front bottom.Through on-site geological survey,the condition of landslide boundary and the crack distribution on the slope are controlled by the early tectonic structure surface.By geological mechanism analysis,the landslide side edge,bottom boundary are controlled respectively by two groups of shear structural plane,a tensile structural plane and the surface of this two different layers.The deformation on the surface of this landslide is obviously.Through the on-site qualitative judgment and calculation,the results show that the landslide is in unstable state under natural condition,and under heavy rain or earthquake conditions,its stability will be much worse.Therefore,the authors put forward a management proposal by clearing the surface loosen rock mass and construct surface drainage.Combining the surface deformation indication and geomechanical analysis method,the paper has great reference for identifying the boundary conditions of similar rock landslides,formation mechanism analysis and stability evaluation.