【摘要】 为了探究急倾斜煤层开采后水平基岩形成的承载结构及地表变形的特征,采用离散元数值模拟计算与实验室相似材料模拟实验进行研究分析。研究结果表明:急倾斜煤层开采后,基岩形成拱脚位于煤层顶底板稳定岩层内的非对称应力拱结构,煤层采厚以及开采垂高的变化对应力拱范围的大小以及失稳形式都有着影响。应力拱承载上覆基岩与冲积层,其稳定性对地表下沉有着重要意义,地表下沉最大值与应力拱拱顶的水平坐标基本相同。应力拱失稳形式有两种,分别为"变形失稳"与"结构失稳"。更多还原

【Abstract】 To explore the load-bearing structure of horizontal bedrock and the features of surface subsidence in steep coal seam mining,discrete element numerical simulation and similar material simulation experiments in laboratory were carried out.The results showed that asymmetric stress arch,whose bases were in the stable rock of coal seam roof and floor,was formed at the horizontal bedrock after mining steep coal seam.The mining thickness and altitude had effect on the shape and instability mode of stress arch.Stress arch,whose stability had significance to surface subsidence,borne the overburden and alluvium.The maximum subsidence value and the horizontal coordinate of the stress arch top were basically the same.The instability modes of stress arch were divided into "deformation instability" and "structure instability".更多还原