Localized Outburst Prevention Technology for 4331 Air Gateway Heading Face in Jinneng Coal Industry Branch

The 3^# seam in 4331 coal face of Jinneng Coal Industry Branch is high coal and gas outburst seam, and the permeability coefficient of coal seam is low and gas hosting is uneven. Dynamic phenomenon was occurred as coal uncovering in a cross-cut. And 4331 air gateway is in unprotected range of upper protected layer.The method of continuous flow is used to forecast the outburst hazard in front of the coal body. And advanced boreholes for methane drainage, gas pre-drainage drilling fields are adopted to prevent coal and gas outburst. And then, effect test and region verification should be implemented until there is no outburst risk in working-face.