基于三维数值模拟的采动滑坡变形机理分析

Deformation Mechanism Analysis of Mining Landslide Based on Three-dimensional Numerical Simulation

在深层煤炭资源丰富的地区,采动滑坡是不同于普通滑坡的一种特殊地质灾害,其形成往往是由煤层开采而引起的,以采动滑坡为例,建立三维模型,探讨采动滑坡的变形机理,研究表明:采空区作为采动滑坡产生的“启动因素”,其主要造成坡体应力发生改变从而诱发坡体的滑动;在采动滑坡变形机理分析中划分倾倒拉裂区域是合理的,倾倒拉裂的存在是造成地表位移分布范围远大于煤层开采范围以及促使坡体裂缝发育的关键因素;在今后采动滑坡的治理与防治工作中,应注重对采空区的变形分析制定有针对性的治理措施,以免盲目治理滑坡而忽略采空区问题。

In areas rich in deep coal resources,mining landslide is a special geological disaster different from ordinary landslide,which is often caused by coal seam mining.Taking the mining landslide as an example,a three-dimensional model is established to discuss the deformation mechanism of mining landslide.The research shows that:As the"starting factor"of mining landslide,the goaf mainly causes the change of slope stress and induces slope sliding.In the analysis of mining landslide deformation mechanism,it is reasonable to divide the toppling crack area.The existence of toppling crack is the key factor that causes the distribution range of surface displacement far beyond the mining range of coal seam and promotes the development of slope cracks.In the future treatment and prevention work of mining landslide,we should pay attention to the deformation analysis of goaf and formulate relevant targeted treatment measures,so as not to blindly treat landslide and ignore the problem of goaf.