Research on Mining Protective Effect in the Long Distance Upper Protective Seam of Tong'an Coal Mine

The long distance upper protective seam mining in Tong'an Coal Mine is considered as the research object in this paper. Through testing the parameters change in the 15th outburst coal seam of Tong'an Coal Mine, which include gas pressure, gas flow, permeability, relative deformation, it studies the outburst protection effect that the 5th coal seam as upper protective seam gives the lower 15th coal seam effective protection. The results show that the original gas pressure of the 15th coal seam drops obviously within the lower protected scope, the relative deformation increases to 2.41 ‰, gas flow increases in 67 folds and the permeability coefficient increases in 115 folds. The 5th long distance upper protective seam gives the lower 15th protected coal seam a good protective effect.