Parameters Investigation of Local Outburst Prevention Measures at Ⅱ 884-1 Driving Face of No.8 Top Slice in Luling Coal Mine

According to the gas geological condition of the coal mine, the rational parameters of local outburst prevention were investigated at II 884-1 driving face of No.8 top slice in Luling coal mine. By using the borehole flow method and outburst prevention effect test method, it determined the effective influence radius of advanced emission drilling with roadway driving diameterφ75 mm, which was 1.2 m.Through improving the relevant parameters of tunnel wall drilling place and borehole,driving speed was raised, there was no gas concentration overrun and outburst in the driving process. It indicated that the local prevention measures for the coal roadway had yielded very good results, achieved rapid excavation safely in outburst coal roadway.