高陡山体下煤层重复采动诱发岩质斜坡变形破坏过程分析

Analysis of deformation and failure process of rock slope induced by repeated mining of coal under high and steep mountain

为研究高陡山体下煤层重复采动诱发岩质斜坡变形破坏过程,采用离散元数值模拟的方法,建立了高陡地形条件下煤层采动数值计算模型,从水平位移云图和纵向位移云图来分析煤层重复采动诱发岩质斜坡变形的渐进破坏过程。得出高陡山体下重复采动诱发坡体崩塌经历了3个阶段,即煤层初始变形阶段、重复采动导致坡体不均匀沉陷开裂阶段,坡体整体失稳垮塌阶段;同时得出坡体的不均匀变形引起整个坡体不同位置产生不同形式的破坏,坡表的最终失稳形式有滑坡和崩塌2种,主要由坡体的原始地形坡度和地层岩性决定。

In order to study the deformation and failure process of rock slope induced by repeated mining under high and steep mountain body, a numerical calculation model of coal seam mining under high and steep terrain was established by using the method of discrete element numerical simulation. The progressive failure process of rock slope deformation induced by repeated mining was analyzed from horizontal and longitudinal displacement nephograms. It is concluded that there are three stages of slope collapse induced by repeated mining under high and steep mountains, namely, initial deformation stage of coal seam, uneven subsidence and cracking stage of slope caused by repeated mining, and instability and failure stage of slope. At the same time, it is concluded that the uneven deformation of the slope results in different forms of damage at different positions of the whole slope.The final instability forms of the slope surface are landslide and collapse, which are mainly determined by the original topographic gradient and stratigraphic lithology of the slope.