Abstract
Based on the Feng Huang Coalmine 1402# coalface, applying the vertical three zones of overlying strata theory and O-ring theory, this paper discusses the migration paths of pressure-relieved gas in stope and the abundant gas region. By means of optimizing the roof crossing borehole method and high-position borehole in gob method, the gas drainage efficiency and extraction concentration have been improved, the gas emission arising from coalface has been reduced, and the gas accumulation phenomenon has been eliminated, which verifies the accuracy of this research and realizes the safe and efficient gas extraction goal as well.
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