Research on the Collaborative Extraction Technology of High-Position and Strike-Inclined Crossed Boreholes

In order to solve the problem of overrun gas in the working face during mining, the method of combining theoretical analysis and field measurement was used to study the law of movement and failure of mining overburden rock, divide the range of "vertical three belts" of overlying rock strata in stope, clarify the fracture distribution characteristics of coal and rock seams, and study the relationship between mining influence and pressure relief gas migration and accumulation. On this basis, the gas enrichment area of the overburden rock in the stope was studied, the range of the coal seam pressure relief area and the gas migration law in front of the working were simulated and analyzed, and the layout parameters of the high-level borehole and the diagonal borehole of the coal seam in the mining area were optimized. A systematic collaborative extraction scheme for pressure relief gas in the mining area of the fully mechanized mining face was formed.