采动和降雨影响下含深大裂隙岩溶山体破坏机制

为阐明采动和降雨入渗条件下含深大裂隙岩溶山体变形和破坏规律，以贵州省纳雍县普洒滑坡为例，通过块体离散元数值分析，探讨煤层开挖扰动和降雨入渗作用下含深大裂隙岩溶山体失稳破坏机制。结果表明，随着M10和M14煤层开采，山体上覆岩层向采空区方向下移，新生裂隙向坡表发育。工作面上覆岩层裂隙带高度随采空区范围的增大而增加，M10和M14开采结束后，裂隙带分别发育至30倍和40倍采高，坡顶深大岩溶裂隙向坡下扩展。降雨入渗后，上覆岩层裂隙带与深大岩溶裂隙贯通，在孔隙水压力作用下深大岩溶裂隙向坡表扩展形成贯通滑动面，岩溶坡体发生崩滑破坏。研究发现，地下采动是普洒老鹰岩山体变形破坏的控制因素，后续降雨是山体失稳的主要诱发因素。

Failure mechanism of karst mountain with deep and large fissures under the influence of mining and rainfall

To clarify the deformation and failure law of karst mountain with deep and large fissures under the action of mining and rainfall, by taking the Pusa landslide in Nayong County of Guizhou Province as an example, the instability and failure mechanisms of karst mountain with deep and large fissures under the action of mining and rainfall were discussed through block discrete element numerical analysis. The results show that the overlying strata of the mountain moved down to the mined-out area with the mining of coal seams M10 and M14, and new fraclures developed to the slope surface. Simultaneously, the height of the the fracture zone of the overlying strata in working face increased with the increase of the goaf range. The fracture zone developed to 30 and 40 times the mining height after mining M10 and M14, respectively, and the deep karst fissure expanded to the lower slope. After rainfall and infiltration, the fracture zone of the overlying strata was connected with deep and large karst fissures. The deep and large karst fissures expanded to the slope surface to form a potential sliding surface under the action of pore water pressure, leading to the collapse and slide of the karst slope. Through comparative study, mining is the control factor of the deformation and destruction of the Laoyingyan Mountain, and subsequent rainfall is the main inducing factor of slope instability.