Key Technology of Pillarless Coal and Gas Simultaneous Mining in Low Permeability Seam Group

In order to effectively solve the control problems of the low permeability high gas seam group,to highly promote the application of the pillarless coal and gas simultaneous mining technology in low permeability seam group and to promote the continuous improvement of the mine safety situation,the paper in detail introduc ed the background of the key technology,the update innovation achievements and the project practice cases.From the gateway retained backfill method,gas pressure rel easing and drainage and other aspects under the typical geological conditions,the paper analyzed the application status and development tendency of the technology.T he results showed that the optimized backfill system and the gas drainage system from the design could release the automation of the backill,the gas drainage maximiz ation and the cost minimization and could promote the standardization and industrialization of the technology application. The continued improved and developed pillarle ss coal and gas simultaneous mining theory and technology could provide the scientific reliable technical access to the safety and high efficient mining in the low perme ability and high gassy seam group.