关键词: 近距离煤层, 坚硬顶板, 切顶卸压, 切顶位置, 煤柱宽度

Abstract: For multilayer hard roof roadway in coal face of close distance coal seam mining in high stress state when the problem of difficult to maintain, taking the close coal seam of Ximing Mine of Shanxi Coking Coal Group Company as the research object, combining the theoretical analysis and numerical simulation, proposed under the condition of hard roof close distance coal seam mining eliminated by cutting roof pressure relief method of roof overhang structure, The influence of cutting roof position and pillar width on the stress and stability of roadway surrounding rock is studied. The results show that when the coal seam with multi-layer hard roof is mined in close distance, after the upper coal seam is mined, there is a large span suspended roof structure with unfavorable surrounding rock stability in the roadway of the lower coal seam. Reasonable cutting roof position can effectively eliminate the influence of suspended roof effect on the stress distribution of surrounding rock in the lower coal seam roadway. The width of the upper coal pillar affects the deformation rate of the surrounding rock of the lower coal seam, and the width of 30m coal pillar is the critical cut-off point of the deformation rate of the surrounding rock of the roadway.