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汪洋煤矿是一个核定生产能力390 kt/a的高瓦斯矿井,开采一层煤层瓦斯含量低、透气性差的薄煤层。矿井在正常开采过程中,对拉工作面、尾巷常常瓦斯超限。在分析瓦斯来源的基础上,采取顶(底)板钻孔抽放、采空区埋管抽放瓦斯措施后,矿井总回风巷瓦斯浓度从抽放前的0.6%左右降到0.32%,基本消除回采工作面回风斯超限情况,实现矿井瓦斯抽放率和抽放瓦斯浓度均达到30%。
Wang Yang Coal Mine is a high-gas mine with a production capacity of 390 kt / a and has a low coal seam methane content and poor gas permeability. In normal mining process, the mine face, tail gas often exceed the limit. Based on the analysis of gas sources, taking the drainage of top and bottom bores and the gas drainage by burying pipe in goaf, the gas concentration in the total return airway of the mine reduced from about 0.6% to 0.32% Basically eliminate the situation of overcoming the limit of returning to the mining face, and achieve the gas drainage rate and the gas drainage density reaching 30%.