【摘要】 水力冲割煤层卸压抽放瓦斯技术的试验研究表明了水力冲割煤层孔比普通钻孔抽放瓦斯量可提高７９％以上。为我国难抽煤层有效地抽放瓦斯开辟了一条新的技术途径。更多还原

【Abstract】 This paper describes the test and study of pres-sure relief degasfication technology by hydraulic impactingand cutting coal bed in Zhaogezhuang Mine of KailuanCoal Mine Administration.The result shows that thebrehole impacted and cutted by high pressure water canproduce a methane quantity of 79% higher than that ofthe conventional borehole; which has openned up a newway for draining methane from the low permeability coalbed.更多还原