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低透气性煤层瓦斯抽采是我国矿井瓦斯治理的瓶颈所在。近年来水力射流技术在矿井石门揭煤、底板巷消除地应力方面有了很大的发展,因此,开展水力射流技术在本煤层强化瓦斯抽采方面的研究具有重要意义。采用水力射流扩大钻孔的直接影响范围,通过对扰动煤体的体积、表面积、单孔瓦斯抽采量、钻孔影响半径的考察,对比分析了水力射流技术和钻孔抽采技术的数据,得出钻孔直径增大11.7～19.2倍,扰动煤体体积提高3 471～6 971倍;钻孔瓦斯衰减周期延长了7～10倍;单孔抽采效果提高6～8倍。
Low permeability coal gas drainage is the bottleneck of mine gas management in China. In recent years, hydraulic jet technology has been developed greatly in the coal uncovering in Shimen Mine and floor stress relieving. Therefore, it is of great significance to carry out the study of hydraulic jet technology in the enhanced gas drainage in this coal seam. Hydraulic jet was used to expand the direct influence range of boreholes. Based on the investigation of the volume, surface area, single-hole gas drainage volume and the influence radius of borehole, the hydraulic jet technology and drilling drainage technology data were comparatively analyzed. The results show that the diameter of borehole increases 11.7 ~ 19.2 times and the volume of disturbed coal body increases by 3 471 ~ 6 971 times; the gas attenuation period of borehole prolongs by 7 ~ 10 times; the effect of single hole pumping increases by 6 ~ 8 times.