Study on prevention and control of fire and gas leakage in overlying goaf of shallow-buried close coal seam group
In view of the spontaneous combustion of coal seams and gas leakage in overlying goaf of the shallow-buried close coal seams in the 13103 working face of Shaping Coal Mine,the ground infrared detection and isotope radon measurement methods were comprehensively used to detect the spontaneous combustion state of the goaf overlying the 13103 working face.On this basis,SF6 gas was used to measure the air leakage channel,and numerical simulation was used to analyze the mechanism of CO gas leakage.The research results showed that the spontaneous combustion tendency of coal seams,complex burial conditions and old kiln fire area were the main reasons for the spontaneous combustion of coal seams.Based on the demarcated twelve fire center points and 39 077 m2 hidden danger areas,it was found that the connecting fractures of the ground surface,goaf fire area and working face led CO gas to flow into the second half of working face and gather at the return corner.The high temperature points in the overlying goaf were eliminated through the joint prevention and control method of surface and underground,which made the CO concentration stable below 0.05％,effectively controlled the coal spontaneous combustion and gas leakage in the goaf,and ensured the safety production of 13103 working face.
close coal seam groupgoafcoal seam spontaneous combustiongas leakagenumerical simulationjoint prevention and control of surface and underground
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