近距离煤层采空区底板破坏特征及影响分析

摘要

针对近距离煤层开采过程过中，上层煤开采过后导致下层煤巷道围岩受扰动破坏，下层煤回采巷道围岩破碎严重、完整性较差的实际情况，利用滑移线场理论再结合部分矿场，进行实际计算不同采高时上层煤采空区底板破坏的范围，并根据两煤间距变化情况对不同状况下下层煤巷道稳定性进行分析，得出了采空区底板最大破坏深度随采高的增加而增大、两煤间距越大对下层煤巷道稳定性影响越小的结论。%In the mining process of close distance coal seams, after mining the upper coal seam, the lower coal roadway surrounding rock will be damaged by disturbance. The surrounding rock of the lower coal gateway will be serious broken and with poor integrity. Based on this situation, by slip line field theory, and combined with some mine fields, the upper coal seam goaf floor damage range is calculated. And according to the distance between the two seams, the lower coal seam gateway stability is analyzed. The conclusion is that the maximum damage depth of the goaf floor increases as the mining height increase and the bigger the distance between the coal seams, the less impact on the stability of the lower coal seam gateway.