Method of Gas Drainage from Goaf by Long Drilling in the Roof Direction of Fully Mechanized Caving Face
In order to solve the problem of poor effectiveness of ordinary high-level drilling for gas extraction,a gas extraction scheme mainly based on directional long drilling for roof high-level drilling was proposed in the 5110 working face of Pulongwan Mine as the engineering background.Based on the theoretical analysis of the high-level fracture layer and historical investigation,it is determined that the directional high-level fracture extraction layer of the 5110 working face is set between 25～50 meters.The on-site extraction effect shows that during the directional high-level drilling extraction period,the gas in the upper corner is significantly reduced,and the gas concentration in the corner is maintained between 0.30%and 0.48%.The concentration of gas extracted by directional drilling is closely related to the roof pressure of the working face,and the extraction concentration increases significantly when the roof pressure is applied.
directional high positiongas outburstgoafgas extraction
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