虎龙沟煤矿巷式采空区上覆煤层上行开采可行性研究

Feasibility study on the upward mining of the overlying rock in goaf of roadway tape in Hulonggou Coal Mine

针对大同矿区虎龙沟矿采空区上覆煤层上行开采,综合应用理论计算、数值分析等方法,对8#煤采后煤柱稳定性、上覆岩层运动规律、5#煤层底板的连续性和完整性进行了分析。研究表明,当上煤层位于下煤层开采的垮落带上方时,上煤层及其顶底板整体性遭到一定的破坏,但仍能保持连续性;随着下煤层开采后时间的推移,煤层中形成的裂隙逐步"愈合",煤层的整体性得到改善,能满足开采所需的条件。

Aiming at the upward mining of the overlying rock in goaf of Hulonggou Mine, by comprehensively applying the theoretical calculation and numerical analysis, the coal pillar stability, the overlying rock movement law, the floor continuity and integrity of 5~#coal seam are analyzed after mining 8~#coal seam. The study shows that, when the above coal seam is located above the caving belt of the following coal seam mining, the integrity of the above coal seam and its roof and floor is damaged, but it can maintain continuity; With the passage of time after the coal seam mining, the cracks in the coal seam are gradually ＂healled＂, the integrity of the coal seam is improved to meet the conditions for mining.