Three dimensional gas drainage technology of three areas linkage in Binchang Mining Area

In order to establish the theoretical study system and engineering practices on the three areas linkage technology of the gas drainage with the features 0 f Binchang Mining Area, with the gas resource reserves and distribution features of the mining area as the start point, based on the seam gas drainage mechanism, the paper had a study on the gas drainage technology with " a linkage of planning area, preparation area and production area" in the mining area, the mode and technique of the gas drainage linkage technology at the mine surface and in the underground mine, the surface gas drainage well connected and linked with gas drainage borehol e technology in the underground mine, the pressure released linked with three dimensional gas prevention and control technology of close distance coal seams and oth ers. With the study and engineering practices, the gas three areas linkage drainage in the mining area was realized, an annual gas drainage volume of the mine was inc reased annually, the gas problem in the production area was solved in advance from the time and space, the mine gas drainage rate was over 75%，the seam gas conte nt was rapidly reduced from 6.8 m3/t to below 2.5 m3/t and the high gas area changing to a low gas area was realized. Meanwhile, based on the mine gas zero overlimit realized, the ventilation gas content of each coal mining face was kept below 5 m3/min, the ventilation gas content of the gateway driving face was kept below 3 m3/min and was reduced annually and thus the mine intrinsically safe and high efficient green mining were promoted and realized.