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In Weijiadi Coal Mine, the No.2 coal seam is uncovered by the Donger return air shaft. According to the concept of “regional measures first, local measures supplement”, the measures are taken strictly in the outburst seam, the gas pressure P=0.2MPa and the gas content W=1.4729m 3 /t in the coal seam are determined by preconstruction prediction drilling, and there are no gas dynamic phenomena such as drilling jam and sticking in the drilling process. It is proved that there is no outburst danger, and then it is implemented according to the local “four in one” outburst prevention measures. The maximum gas pressure determined is 0.2 MPa in the working face, and the validity check is still no outburst danger. Finally, safety protection devices are installed in the working face to ensure the No.2 coal seam to be uncovered smoothly by return air shaft.

Practice of Outburst Prevention Technology for Uncovering No.2 Coal Seam in Donger Return Air Shaft of Weijiadi Coal Mine