Feasibility Analysis of Overhead Mining in 2-1 Middle Coal Seam of Cuncaota Mine

Based on the geological occurrence conditions of close coal seam group in Cuncaota Coal Mine, with mine pressure theory analysis, the comprehensive research of analog simulation and numerical simulation method, we study the safety and feasibility of 2-1 middle coal seam in Cuncaota Coal Mine. The results are that the space between 2-1 middle and 2-2 upper is greater than the safe distance of ascending mining of coal seam; the room and pillar mining at lower 2-2 upper coal seam did not make the upper 2-1 middle coal seam destroyed; there is thick key stratum with certain thickness of safety isolation in roof after room and pillar mining at the lower 2-2 upper coal seam; carrying out overhead mining at 2-1 middle coal seam of Cuncaota Coal Mine, adopting reasonable roadway layout and mining methods, taking effective safety technical measures, all these can ensure the safety and efficient of the 2-1 middle coal seam in overhead mining.