Abstract:

In order to solve the problem of gas in coal mining of close coal-seams with high gassy and outburst mine, based on the No.3 coal seam of songhe coalmine, through careful analysis of coal and gas geological characteristics, using the comprehensive gas control technology of crossing borehole preliminary drainage, gas drainage, high roadway drainage, pipe goaf drainage, high level borehole drainage and borehole intercept pressure relief gas, the working face has been effectively eliminated outburst. The upper corner gas concentration stabilized at 0.43% ~ 0.58% and the gas drainage rate of working face has reached 80%, and formed the technology system of comprehensive gas control. This technology solved the problem of gas control of coal mining in close coal-seams with high gassy and outburst mine.

Key words: Crossing borehole, High-level roadway, Tubing buried in goaf, Relieved methane, High level borehole