特厚煤层工作面定向长钻孔以孔代巷瓦斯抽采技术

Directional Long Borehole Replacing Roadways with Holes Gas Extraction Technology in the Extra Thick Coal Seam Working Face

为解决高瓦斯特厚煤层采煤工作面瓦斯超限问题,研究了大佛寺矿井采煤工作面不同阶段瓦斯抽采效果,确定了高位定向钻孔抽采方式治理采空区瓦斯,分析了钻孔层位、平距及周期来压、涌水量对高位定向钻孔抽采效果的影响。结果表明,高位定向钻孔最大瓦斯抽采量达13.34m^(3)/min,可有效降低工作面瓦斯。

In order to solve the problem of gas overrun in the working face of high gas and extra thick coal seam,the gas drainage effect at different stages of the coal mining working face in Dafosi Mine is studied,the high level directional drilling holes drainage method is determined to administer the gas in the goaf,and the influence of the drilling holes horizon,horizontal distance,periodic pressure and water inflow on the high level directional drilling holes drainage effect is analyzed.The results show that the maximum gas drainage volume of high level directional drilling holes is 13.34 m^(3)/min,which can effectively reduce the gas of the working face.