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通过三角形布置水力致裂钻孔、互为卸压孔和观测孔、深封孔短封孔长度等保障了突出煤层掘进头超前深孔水力致裂驱赶的安全性.采用现场试验观测了水力致裂的裂缝扩展与瓦斯驱赶范围,分析了水力致裂前后突出危险性指标、打钻难易程度、迎头瓦斯体积分数、瓦斯抽采效果和消突效果的变化.在水力致裂导致的孔隙水压力和瓦斯驱赶作用下,水力致裂结束后立即钻区域抽采孔较困难;4h后打钻就非常容易,很少出现吸钻、喷孔、煤炮声等现象.薛湖矿4条煤巷掘进的实践表明该技术区域消除了突出危险性.突出煤层掘进节省了10个区域孔的工程量和施工时间,区域消突瓦斯抽采时间减少8.3h以上.
The safety of hydraulic fracturing driven by the advanced deep hole of the outburst coal seam is ensured by arranging the hydraulic fracturing holes in triangle, the pressure relief holes and the observation holes in each other, the length of the short sealing holes in the deep sealing holes, etc. The field- Crack propagation and gas driving range before and after hydraulic fracturing were analyzed, and the prominent dangerous indexes before and after hydraulic fracturing, the degree of drilling difficulty, the head gas volume fraction, the effect of gas drainage and the effect of eliminating gas outburst were analyzed.In the pore water caused by hydraulic fracturing Under the pressure and gas drive, it is more difficult to drill holes in the area immediately after hydraulic fracturing, and it is very easy to drill after 4h, so there are few phenomena such as suction drilling, jet hole and coal gun sound. The practice of roadway excavation shows that this technology area has eliminated the outstanding danger.Exploiting the coal seam excavation has saved the work volume and construction time of 10 holes in the area, and the time of gas drainage and gas drainage in the area has been reduced by 8.3h or more.