Research on Remote and Near-Field Gas Collaborative Joint Control Technology in Coal and Gas Outburst Coal Seam

Aiming at the time and space limitation of gas control in the first mining face of newly built outburst mine, this study takes Longfeng Coal Mine in Guizhou as the engineering background and puts forward a concept of far- and near-field gas collaborative joint control based on "orientation + general drilling". The correlation between effective extraction radius and extraction time of No. 9 coal seam is determined by establishing the mathematical model of gas migration in which stress field, diffusion field, and seepage field are coupled. Combined with the mining and deployment planning of the first mining face, the three-level strengthened regional gas management scheme of "directional middle, cross-layer, and cross-layer supplement" was designed, the spacing of drilling holes was optimized, and the spatiotemporal collaborative joint management system of gas advanced large areas was constructed. Practice has proven that the three-level gas extraction cooperative and joint management mode adopted in the 1903 first mining face effectively realized the spatiospatial matching of gas extraction and mining progress at all levels, realized the gas extraction standard and safe mining in advance, and provided an effective technical solution for the gas treatment of the first mining face in the newly built outburst mine.