关键词: 顺层长钻孔, 超高压, 水力割缝, 瓦斯流量

Abstract: In order to improve the gas drainage efficiency of beveled boreholes in the high-speed +450m horizontal inlet wing of Gaohe Coal Mine, ensure the safety and rapid excavation of +450m horizontal north wing into the wind lane, and develop a GF suitable for the characteristics of No. 3 coal in Gaohe Coal Mine. -100 type ultra-high pressure hydraulic slotted joint device, researches on the technical feasibility and implementation scheme of integrated high-pressure water drilling and slotting, and preliminary inspection of slotting effect. The results show that the second increase in the penetration of the hydraulic slats directly on the foundation of the dredging drilled hole can increase the extraction radius of the slotted hole to 2.4m and reduce the construction volume by nearly 50%. Gas flow can be increased 1.8 to 3.6 times. Hydraulic kerf technology can effectively improve the gas drainage efficiency of low permeability coal seams and is worthy of promotion.