以孔代巷瓦斯抽采工艺技术应用

Research on gas extraction technology of borehole instead of roadway

为解决新源煤矿12214工作面上隅角瓦斯超限问题,考察了该工作面顶板岩性,研究了顶板裂隙带范围及其对采空区瓦斯流动聚积的影响,对瓦斯涌出量来源进行了分析,确定在不同层位施工一组共7个顶板高位定向长钻孔进行瓦斯抽采,并与一段高抽巷瓦斯抽采效果进行对比。结果表明:历经5个月回采,顶板高位定向长钻孔组与高抽巷平均抽采瓦斯浓度分别为17.24%、21.32%,抽采瓦斯纯流量分别为3.71、3.37 m^(3)/min,回采期间上隅角平均瓦斯浓度分别为0.42%、0.49%。研究表明,顶板高位定向长钻孔影响范围比高抽巷大,抽采瓦斯纯流量提高了10.09%,施工成本比高抽巷低,且施工效率更高,极大地缓解了高抽巷掘进速度对采煤工作面投产的制约,证明顶板高位定向长钻孔能够有效替代高抽巷进行矿井瓦斯抽采。

In order to solve the gas problem in the upper corner of 12214 working face in Xinyuan Coal Mine,the roof lithology of the working face,the range of roof fissure zone and its influence on gas flow and accumulation in goaf were investigated.The source of gas emission was analyzed and a group of 7 high-level directional long boreholes in different strata were determined.These were to compare the pumping effect with that of the first high drainage roadway.The results show that after five months of mining observation,the average gas concentration of high-level directional long borehole group and high drainage roadway is 17.24% and 21.32% respectively.The amount of pure gas extraction is 3.71 m^(3)/min and 3.37 m^(3)/min,respectively.The average gas concentration in the upper corner is 0.42% and 0.49% respectively.The results show that the influence range of high-level directional long borehole in roof is wider than that of high drainage roadway.The pure gas extraction increased by 10.09%.The construction cost is lower than the high drainage roadway,and the construction efficiency is higher.It greatly alleviates the restriction of high drainage roadway driving speed on coal face putting into production,thus proving that the high-level directional long borehole in the roof can effectively replace the high drainage roadway.