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针对西南地区煤矿石门揭煤周期长,严重制约了煤矿安全生产和采掘工作面接替等问题,提出了利用自激振荡脉冲水射流在煤层中割缝,增加煤层透气性,提高瓦斯解吸率,缩短石门揭煤时间的新思路.研究了高压脉冲水射流自激振荡的形成机理及其特性;通过实验室试验研究供水压力、流量等因素与切槽深度、宽度的关系,优化了自激振荡喷嘴结构及高压脉冲水射流的水力参数.通过在重庆逢春煤矿+523S4机轨巷揭M8煤层应用表明,使用自激振荡脉冲水射流割缝在煤层中的影响范围可达1.5m以上,增大了煤层瓦斯解吸能力,瓦斯释放量提高了4.4倍,钻孔数量减少了60%,缩短工期达70d以上,提高了工效.
Aiming at the problems of long coal uncovering cycle in coal mine in Southwest China, seriously threatening the safe production of coal mine and succession of mining face, the paper proposed the use of self-excited oscillating pulsed water jet to cut seam in coal seam to increase gas permeability, Shimen door open time of new ideas.Study the formation mechanism and characteristics of high pressure pulsed water jet self-oscillation; through the laboratory test of water supply pressure, flow and other factors and slotting depth and width of the optimization of the self-excited oscillation nozzle Structure and hydraulic parameters of high pressure pulsed water jet.The application of M8 coal seam at + 523S4 rail roadway in Fengchun coal mine in Chongqing shows that the influence range of coal seam using self-excited pulsed water jet cutting can reach above 1.5m, The gas desorption capacity of coal seam, gas release increased by 4.4 times, reducing the number of drilling 60%, shorten the construction period of more than 70d, improve work efficiency.