Pressure relief gas extraction technology based on high directional lone borehole in Dafosi Coal Mine
Dafosi Coal Mine in Binchang,Shaanxi is a high gas mine.The absolute gas emission is 190.4 m3/min.The mine gas control work adheres to the comprehensive prevention and control system combining"advanced prediction,organization and management,comprehensive research and judgment,technical support and effect evaluation".The pressure relief in goaf is based on the technical idea of"large aperture,multi-level,high negative pressure,large flow and intensive extraction".Taking the 40204 working face and the 4034 upper 02 working face as the research object,the distribution of mining-in-duced overburden fractures in the working face was studied,and the gas concentration distribution in the goaf under high-level directional drilling was simulated.Based on the theoretical basis of the"O"ring model in the goaf,the"high-level drilling design,layout layer determination and extraction process"of the pressure-relief gas extraction were explored,and the gas control effect was evaluated in combination with the engineering application.The results show that after the implementa-tion of high-level drilling technology,the gas concentration in the upper corner of the working face is stabilized at 0.15％～0.45％,and the gas concentration in the return air is stabilized at 0.2％～0.35％.It is proved that the high-level direc-tional long borehole can effectively control the pressure relief gas of the working face,prevent the gas overrun of the working face,and ensure the safe production of the mine.
Dafosi Coal Minepressure relief gasdirectional long boreholegas extractionengineering appli-cation
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