关键词: 冲沟地貌, 煤层群, 综放开采, 遗留煤柱, 应力演化, 顶板结构, 灾害防治

Abstract: Aiming at the problem of acutely mining pressure in the condition of passing in and out the coal pillar under gully topography when fully mechanized caving in the lower part of the close coal seam group. Numerical simulation method is used to analyze the distribution law of the concentrated stress in the remained upper 9# coal pillar with the engineering background of the 9# and 10# coal seams in Shangyuquan coal mine. The superposition effect caused by the mining stress and concentration stress in coal pillar during the entry and exit of fully mechanized caving face in the lower 10# coal seam is explored. Combined with the roof structure model, it is clear that the instability mode of roof structure are rotary instability with slide instability, rotary angle and rock fracture degree are the key influencing factors of instability. Hydraulic support extrusion disaster prevention measures like driving technology lane under coal pillar and reducing mining thickness in view of the roof plate failure mode are promoted. Providing reference for roof control and disaster prevention in gully topography short-distance coal mining.