Safety and high efficient mining technology of ultra thick seam with double system interaction in Datong Mining Area

According to the cracking developed and connected in the overburden strata above each seam after the mining of the multi seams, accumulated water in the goaf area, harmful gas discharging and other problems, with the double system seam mining in Datong Mining Area as an engineering background, a study means with the physical similar simulation and the site measurement was applied to determine the cracking connection in the overburden strata above the double system seam mining in Datong Mining Area. Based on the analysis and determination of the cracking connection in the overburden strata above the double system seam mining in Da tong Mining Area, according to the accumulated water discharging from the top goaf and the ventilation leakage problems caused by the double system connection zon e, the accumulated water comprehensive detection and the 3D water discharging technical system of the multi seam goaf and the dynamic balance multi point control te chnology and equipment of the flow field in the double system goaf were innovated and studied. The accumulated water danger in the overburden Jurassic goaf were ef fectively solved, the mine spontaneous combustion disaster and the toxic gas and harmful gas overlimit problems of the coal mining face were eliminated and the safety and high efficient production of the mine were ensured.