关瑞斌

摘 要：为了提升突出煤层瓦斯治理效率，增加采面回采巷道掘进速度，在9141底板瓦斯抽放巷内施工水力卸压钻孔对突出煤层进行增透，并对水力冲孔卸压钻孔布置进行设计，有效提升了煤层瓦斯抽采效果。结果表明，采用水力冲孔卸压技术后，瓦斯钻孔流量、浓度为普通穿层瓦斯抽采钻孔流量的2倍以上，流量衰减系数为未冲孔卸压瓦斯抽采钻孔的52%;9141回风巷在水力冲孔卸压段月进尺可达85 m，进尺量较普通穿层钻孔抽采段增加35 m。

关键词：突出煤层;卸压冲孔;瓦斯抽采;煤层透气性

中图分类号：TD712.6文献标识码：A文章编号：1003-5168（2020）19-0061-03

Abstract： In order to improve the gas control efficiency of outburst coal seam and increase the driving speed of mining roadway， hydraulic pressure relief boreholes were constructed in 9141 floor gas drainage roadway to increase the permeability of outburst coal seam， and the layout of hydraulic punching pressure relief boreholes was designed， which effectively improved the coal seam gas drainage effect. The results show that the flow and concentration of gas drilling hole are more than two times of that of ordinary through layer gas drainage hole， and the flow attenuation coefficient is 52% of that of non through layer gas drainage hole; the monthly footage of 9141 return air roadway in the pressure relief section of hydraulic punching hole can reach 85 m， and the footage is 35 m higher than that of ordinary through layer drilling hole.

Keywords： outburst coal seam;pressure relief punching;gas drainage;coal seam permeability

煤炭在可预见的一段时间内将会是我国的主要能源。随着开采强度不断增强，我国突出矿井数量不断增加，开采的突出煤层存在瓦斯治理难度大、煤层透气性差等问题。因此，采用合适的煤层增透技术提升煤层透气性对提升矿井安全生产能力具有重要的现实意义[1]。水力冲孔卸压是一种煤层增透技术，近年来在突出矿井中应用较为广泛[2-3]。本文以某矿开采的9号突出煤层瓦斯治理为工程背景，采用水力冲孔卸压增透技术来提升煤层透气性，提高瓦斯治理效果，从而实现煤层消除目的，现场应用取得显著效果。

1 水力冲孔卸压增透机理

水力冲孔卸压增透是通过在煤体中注入高压水破碎煤体，以使煤体出现一定程度膨胀变形，从而达到突出煤层卸压、瓦斯能及弹性能释放，增加煤层透气性目的;高压水作用到煤体上后煤体出现塑性变形，同时会产生新的次生裂隙，增加瓦斯运移通道[4-5]。……