某矿开采9#煤作为下保护层瓦斯治理研究

Gas Control Study on Mining 9# Coal Mine as Lower Protective Layer

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。

Combining with production practice,a mine by using theoretical calculation and numerical simulation of 9#coal seam in overburden 12~18 m in height,height of fractured zone 30~48 m,namely3#coal seam in 9#coal seam of fissure zone in the upper,and the 9#coal seam of unloading area within the scope of 3#coal seam in inflation rate for the most part within the scope of pressure relief for more than 3 ‰,and range of 3#coal unloading the central expansion after the compression process.Finally using the expansion rate and the engineering analogy method to forecast the unloading effect,the comprehensive analysis that the increase in mining protective layer can effectively discharge pressure and permeability of coal,provide an enabling environment for 3#coal seam in high-efficient exploitation,which demonstrates the 9#coal can be used as a protective layer of 3#coal.