Analysis of Grading Local Integrated Preventive Measures Against Outburst for Non-outburst Coal Mine After Upgrading

With the depth of mining, Yiyuan Mine is upgraded from high-gas coal mine to coal and gas outburst mine. According to gas occurrence regularity and the mining situation of 15^# coal seam of Yiyuan Mine, a scientific, reasonable and achievable design scheme for local integrated preventive measures against outburst is established. The design scheme is divided into three phases for local integrated preventive measures against outburst. The first phase is pre-drainage coal roadway stripes gas and section gas with the bedding boreholes; the second phase is pre-drainage coal seam gas in the roof and floor roadway by pre-drainaging section gas and mining region gas; the third phase is mining protective layer or the combination of mining protective layer and pre-drainage coal mine gas as a supplementary mean.