Shandong Energy Group Xiezhuang Coal Mine

近距离煤层群层间一般采用下行开采,在特定的地质条件、煤层赋存条件和开采技术条件下,只要采取合理的开采技术,开采下部煤层卸压解放上部三硬煤层,可以成功地进行上行开采,近距离煤层采用上行开采会更为有利。以协庄煤矿13和15煤层近距离三硬煤层解放层上行开采为研究对象,采用覆岩裂隙发育、围岩平衡法、采动影响倍数法和数理统计法分析进行理论计算,15煤层开采后对13煤层开采影响均能控制在安全范围内,并通过数值模拟分析加以验证,下部15煤层上行解放层开采减弱上部13煤层和顶底板坚硬岩层的完整性,实现三硬煤层的安全高效开采。

Close distance coal seams generally adopt downward mining between layers. Under specific geological conditions, coal seam occurrence conditions, and mining technology conditions, as long as reasonable mining techniques are adopted, by mining the lower coal seam to relieve pressure and liberate the upper three hard coal seam, the upward mining can be carried out successfully. Upward mining is more advantageous for close distance coal seams. Taking the liberated layer upward mining of the close distance three hard coal seams of the 13th and 15th coal seam in Xiezhuang Coal Mine as the research object, theoretical calculations are conducted using the development of overlying rock fractures, surrounding rock balance method, mining influence multiple method, and mathematical statistics method. The impact of the 15th coal seam after mining on the 13th coal seam mining can be controlled within a safe range, and verified through numerical simulation analysis, the upward liberated layer mining of the lower 15th coal seam weakens the integrity of the upper 13th coal seam and the hard rock layers on the roof and floor, achieving safe and efficient mining of the three hard coal seams.