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为提高低透气性煤层的瓦斯抽采效果,开发了钻射一体化技术,并在韩村矿进行了试验研究。试验过程中,金属射流首先在煤层中射出主裂缝,随后推进剂延迟爆破产生高能爆生气体压裂煤体,破坏煤体的致密结构,在钻孔周围形成松动裂隙圈,达到煤层增渗效果。结果表明,钻孔瓦斯抽采体积分数由措施前的10.1%增加到措施后的42.2%,钻孔瓦斯抽采流量由0.026 m3/min增加到措施后的0.077 m3/min。钻射一体化技术措施增透效果显著,比同等条件下的普通钻孔抽采效果成倍提高,为高瓦斯低透气性煤层高效抽采瓦斯提供了一种有效途径。
In order to improve the gas drainage effect of low permeability coal seam, the integrated drilling and blasting technology has been developed, and experimental research has been conducted in Hancun Mine. During the test, the metal jet first shot out the main fracture in the coal seam, then the propellant delayed blasting to produce high-energy explosive gas fracturing coal, destroying the dense structure of the coal body, forming loose fracture ring around the borehole to achieve the effect of increasing the permeability of the coal seam . The results show that the volume fraction of gas drainage in boreholes increases from 10.1% before the measure to 42.2% after the measure, and the flow rate of gas drainage in boreholes increases from 0.026 m3 / min to 0.077 m3 / min after the measure. The integrated technology of drilling and shotcreting has significant effect of increasing permeability, which is double that of ordinary borehole pumping under the same conditions, which provides an effective way for efficient gas drainage of high gas and low permeability coal seam.