论文部分内容阅读
结合某矿生产实际,运用理论计算和数值模拟得出9#煤层上覆岩层的冒落带高度为12~18 m,裂隙带高度30~48 m,即3#煤层位于9#煤层产生的裂隙带的中上部,且处于9#煤层产生的卸压区范围内,3#煤层膨胀率在卸压范围内绝大部分超过3‰,并且3#煤卸压范围中部存在先膨胀后压缩的过程。最后利用膨胀率和工程类比对卸压效果进行了预测,综合分析认为保护层开采能有效卸压和增加煤体透气性,为3#煤层高效开采提供有利环境,从而论证了9#煤可以作为3#煤的保护层。
Combined with the actual production of a mine, the height of the caving zone of overburden in 9 # coal seam is 12 ~ 18 m and the height of the fracture zone is 30 ~ 48 m, which is the fissure of 3 # coal seam located in 9 # coal seam by theoretical calculation and numerical simulation. In the middle and upper part of the belt, and in the pressure relief zone generated by 9 # coal seam, the expansion rate of No.3 coal seam exceeds 3 ‰ in most of the pressure relief range, and there is the process of the first expansion and compression . In the end, the effect of pressure relief is predicted by the expansion rate and engineering analogy. According to the comprehensive analysis, the protective layer mining can effectively relieve pressure and increase the permeability of coal so as to provide favorable environment for the high efficiency mining of 3 # coal seam. 3 # coal protective layer.