Application and Technique of Pre-draining Relieved Gas by Crossing Borehole at Coal Roadway Strip for Outburst Prevention

Pre-draining gas by crossing borehole at coal roadway strip is one of measures to prevent outburst regionally, but the effect is limited usually. So it is necessary to put forward a new technique. First, taking application in Wangfenggang mine as an example, the technique of pre-draining relieved gas by crossing borehole at coal roadway strip was introduced. Then the drainage data and the outburst prediction data were analyzed after using new technique. The results indicated that there is a broad stress released zone that has a good permeability in front of coal roadway for outburst coal seam and it is appropriate to arrange crossing borehole; gas flow increases significantly at stress released zone and outburst danger is effectively relieved by using new technique.