高瓦斯突出煤层底抽巷穿层钻孔动压瓦斯二次抽采技术及应用
Technology and application of dynamic pressure gas secondary drainage through borehole in bottom drainage roadway of high gas outburst coal seam
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摘要: 为解决高瓦斯突出煤层采动卸压瓦斯涌入采掘作业空间容易造成瓦斯超限和底板岩巷利用率低的问题，使用数值模拟和现场应用方法研究工作面前方煤体瓦斯在动压影响下的高效抽采技术。结果表明：根据现场瓦斯体积分数监测将工作面前方煤体分为高效抽采区、有效抽采区和原始抽采区；高效抽采区在工作面前方20 m以内，平均瓦斯抽采体积分数为30%以上；有效抽采区瓦斯抽采受到动压影响，抽采体积分数随着与工作面距离增大而波动下降；原始抽采区范围为50~60 m以远，钻孔瓦斯体积分数基本稳定在10%以下，受采动影响较小；高瓦斯突出煤层底抽巷穿层钻孔动压瓦斯二次抽采技术在12110采面中抽巷应用效果较好，动压区抽采钻孔数量为非动压区的5%~10%，但月抽采量最高可达到非动压区月抽采量的74.01%。Abstract: In order to solve the problem of gas overrun and low utilization rate caused by mining pressure relief gas pouring into mining working space in high gas outburst coal seam, this paper used numerical simulation and field application methods to study the efficient extraction of coal gas in front of the working face under the influence of dynamic pressure. The results show that according to the gas concentration monitoring data on site, the coal body in front of the working area was divided into high efficiency extraction zone, effective extraction zone and original extraction zone. The efficient extraction zone was within 20 m in front of the working face, with an average gas extraction concentration of 30% or more. Gas extraction in the effective extraction zone was affected by the dynamic pressure, and the extraction concentration decreased fluctuatingly with increasing distance from the working face. The range of the original extraction area is 50-60 m away, and the gas concentration of the borehole was stable below 10%, which was less influenced by the mining movement. The second extraction technology of dynamic pressure gas in the floor gas extraction roadway of high gas outburst coal seam through the crossing boreholes was better applied in the middle extraction roadway of 12110 working face, the number of extraction holes in the dynamic pressure area was 5%-10% of that in the non-dynamic pressure area, but the monthly extraction volume could reach up to 74.01% of the monthly extraction volume inthe non-dynamic pressure area.
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