急倾斜煤层群被保护层卸压瓦斯抽采试验研究

Steep Seam Groups Protective Layer Pressure Relief Gas Extraction Experiments

针对急倾斜突出煤层群瓦斯抽采作业的特殊性,基于急倾斜煤层顶板冒落规律,对被保护层瓦斯抽采效果进行分析,研究被保护层卸压瓦斯运移规律。研究结果表明：受急倾斜煤层采面倾斜上、中、下段岩层移动程度不同的影响,被保护层沿倾斜方向由下至上产生的裂隙逐步增大并彼此贯通,下部煤层卸压瓦斯沿着裂隙往上部流动,上部风巷抽采瓦斯浓度是机巷的2~3倍,流量是机巷的3~4倍,倾斜段上部瓦斯卸压效果明显。

On steep coal seams group of the particularity of the gas extraction operation,based on the rule of steep coal seam roof caving of the protective effect of the gas extraction were analyzed,and the research is protective layer pressure relief gas migration rule. The results show that the mining of deeply inclined coal seam,middle and lower segment on the incline degree of strata movement,the influence of different be protective layer along the tilt direction fractures produced by bottom- up gradually increase and well versed in,each other up along the fractures of the lower coal seam pressure relief gas flow,the extraction from the nerazzurri gas concentration is 2 ~3 times machine lane,traffic is machine lane 3 ~ 4 times,inclined section of the upper gas pressure relief effect is obvious.