Abstract:After Donghuantuo Coal Mine is extended to the -950 level, the gas content and pressure in the coal seam gradually increase, and the risk of gas disaster is high. In order to solve the safety problem of coal uncovering in the new horizontal crosscut, we independently designed and developed a compensated non pressure relief device for upward gas pressure test boreholes and a secondary plugging process of high-pressure grouting, innovatively solved the problems of hole sealing and confined water interference encountered in the pressure measurement process, rationally designed a comprehensive gas control program, and completed the coal uncovering in the new horizontal crosscut safely and efficiently. It has laid a solid theoretical and practical foundation for the subsequent coal seam uncovering and gas control in other coal seams.
