Pressure relief gas control technology under protective layer mining
Aiming at the problem of gas over-limit in the mining process of upper protective layer working face under the conditions of protective layer mining in Xiayukou Coal Mine,and the difficulty of gas control on the working face of protec-tive layer 3 # coal seam,through the prediction of gas emission on working face and the analysis of gas sources,a reasonable gas extraction scheme is determined.Based on the technology of coal and gas co-mining under the conditions of medium and short distance coal seams,we determine the comprehensive gas control schemes such as reasonable layout of through-layer drilling for gas extraction and pressure relief,gas extraction with buried pipe in goaf,pre-extraction along the layer,and sim-ultaneous extraction and extraction.The test results show that the gas over-limit problem did not occur during the mining of the 4216 working face;within the range of 15～35 m in the initial mining stage of the upper protective layer,the pressure re-lief gas extraction enters the active period,and the drilling construction should be carried out at 35 m ahead of the working face.The comprehensive gas control scheme is effective and feasible with referential significance for the gas prevention and control of outburst mines in Hancheng mining area.
gas over limitgas extractionprotective layer miningsimultaneous mining of coal and gaspressure relief gas control
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