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为研究薛湖煤矿穿层钻孔水力扩孔对瓦斯抽采效果的影响,采用FLAC~(3D)软件模拟穿层抽采钻孔扩孔0.6 t/m煤量前后钻孔瓦斯增透圈大小变化情况,现场实测2306工作面底抽巷穿层抽采钻孔冲孔0.6 t/m煤量与未冲孔钻孔在相同抽采时间内的瓦斯抽采量和有效抽采半径,并进行对比分析。结果表明,薛湖煤矿穿层抽采钻孔扩孔0.6 t/m煤量后,钻孔的瓦斯增透圈增大了62.5%,初始抽采纯量增加了100%,抽采75 d的抽采总量增加了70%,钻孔的有效抽采半径达到1.1 m所需时间缩短了77.2%,薛湖煤矿穿层钻孔水力扩孔可有效提高煤层抽采效率。
In order to study the influence of hydraulic reaming on the gas drainage effect of horizontal borehole in Xuehu coal mine, FLAC ~ (3D) software was used to simulate the size of gas ring before drilling and reaming Changes, the scene measured 2306 working face at the bottom of the tunnel through the tunnel drilled hole punching 0.6 t / m coal and non-perforated drilling in the same extraction time of gas extraction and effective extraction radius and carried out Comparative analysis. The results show that the gas permeability circle of the borehole increases by 62.5% and the original pumping capacity increases by 100% after 75 m The total pumping capacity increased by 70%, and the effective drilling radius of the borehole reached 1.1m, the time required for the drilling was shortened by 77.2%. The hydraulic reaming in the strata through the borehole in Xuehu Coal Mine can effectively improve the coal mining efficiency.