煤层底板穿层钻孔水力冲孔技术的应用及效果考察

Coal Floor Layer of Drilling Hydraulic Punching Technology Application and Effect of Investigation

采用底抽巷穿层钻孔水力冲孔卸压增透措施,可以有效增强煤层的透气性、扩大抽采半径和提高瓦斯抽采效果。基于水力冲孔卸压增透原理,对郑州矿区振兴二矿突出煤层实施底板穿层水力冲孔,考察水力冲孔前后瓦斯抽放浓度、煤层透气性和瓦斯流量衰减系数等的变化。试验结果表明:单孔平均瓦斯抽放浓度在水力冲孔后为11.02%,较未采取增透措施时的2.14%,提高了4倍;煤层透气性系数在采取措施后提高了39倍;瓦斯流量衰减系数则减小了近3倍。同时运用压力法测得该矿水力冲孔有效抽放半径为10 m。

End of the alley pumping wear layer drilling hydraulic punching pressure, the anti -reflection measures can effectively enhance the permeability of coal seam, expanding radius of extraction and improve the effect of the gas extraction. , on the basis of the principle of antireflection unloading hydraulic punching in for zhengzhou mining revitalization of two coal mine hydraulic punching plate wear layer, gas drainage concentration before and after the hydraulic punching, the change of coal seam permeability and the gas flow attenuation coefficient and so on. The test results show that the average single - hole gas drainage concentration is 11.02%, after hydraulic punching is 2.14% , the anti - reflection measures of improve 4 times; Coefficient of permeability of coal seam after taking steps to improve the 39 times ; The gas flow attenuation coefficient is reduced nearly 3 times. Using the method of pressure measured at the same time the mine hydraulic punching effective drainage radius to 10 m.