Study on Spontaneous Combustion “Three Zones” in Gob Area of Pressure Equalizing Working face in Super Thick Coal Seam Based on Drilling Technology

To solve the problem of “three zones” test of spontaneous combustion in goaf of super-thick spontaneous combustion coal seam, this paper takes the goaf of 8207 working face in Tongxin Coal Mine as the research background, uses borehole construction in the roadway adjacent to the goaf, and obtains oxidation band width within the range of 30 m to 184 m by means of gas sampling analysis in different depths of borehole. The results of “three zones” test of goaf under the conditions of uniform pressure ventilation (8207 face) and negative pressure ventilation (8100 face) are compared and analyzed. The results show that “three zones” in goaf are obviously “drifting” and the width of oxidation zone is “widened” after pressure equalization on 8207 surface. The distribution distance of goaf in 8207 fully mechanized top coal caving face is optimized, and the hidden danger of goaf ignition during the stoping of 8207 face is effectively controlled.