Technology and practice of enhanced seepage enhancement in driving face of high gas coal seam based on hydraulic cutting

Based on the excavation of transport roadway in 150112 test face of Yiyuan Coal Industry and the GF-100 type ultra-high pressure hydraulic cutting equipment, the technical principle of high pressure hydraulic cutting in coal roadway excavation to enhance gas extraction is analyzed.Combining the high pressure hydraulic cutting technology with the safe and fast tunneling of coal roadway in high gas mine, the permeability characteristics of coal body in tunneling face are improved, the gas drainage effect is enhanced, and the rapid tunneling technology system of coal roadway based on hydraulic cutting is formed, which has been applied in the tunneling of coal roadway in test face.The results show that the application of high-pressure hydraulic cutting technology in the tunneling operation of coal roadway in high gas mine solves the problems of large amount of boreholes and long drainage period with conventional construction measures.During the period of hydraulic cutting operation, the gas drainage volume has increased by 2.36-2.4 times, and the average daily footage has increased by nearly 2.5 times.