中文摘要：

针对高瓦斯低透气性煤层石门揭煤过程中瓦斯抽采难的现状,提出了高压水射流割缝提高煤层透气性方法。在理论分析射流轴向速度的分布规律基础上,得出射流冲击力与煤体力学性质耦合作用关系;通过分析煤体颗粒运动、受力状态,得出钻孔倾角、水量与煤体颗粒流速之间的关系;基于连续损伤力学分析出煤体产生损伤破坏的临界值,确定了高压水射流割缝煤体有效半径;并将该技术在平顶山某矿-380mS4石门进行现场试验,试验结果表明钻进工程量减少了38.2%,瓦斯预抽率提高了2.86倍,预抽时间缩短了57.1%,预抽面积增加了2.05倍。

英文摘要：

According to the problems of gas drainage in rock cross-cut coal uncovering on high gassy coal seam with low gas permeability coal seam,a novel technology which uses high pressure water jet to slot coal seam is presented to raise the methane drainage radius and permeability.Based on the distribution of water jet velocity,the relationship of impact force of water jet and characters of coal is analyzed.Besides,the velocity of coal partial basing on the relationship of force of partial and dip of drilling is studied.Then,the effective diameters of slotting are calculated.Finally,the novel technology is applied to the Pingdingshan mine.The results show that quantities is decreased 38.2%,gas drainage rate is increased 2.86 times and the period of gas drainage is reduced 57.1% and the area of the gas drainage is widened 2.05 times compared to original technology.