FIELD: mining.
SUBSTANCE: invention relates to the mining industry and is intended to ensure safety of the cleaning operations in the underground mining of gas-bearing coal seams under pillar development system. Method for preparing gas-bearing coal seam to be worked out in columnar development system is proposed, including penetration of delineating drifts, drilling them into formation of injection and degassing wells, placement of injection wells at distances equal to two sealing lengths and subsequent hydroprocessing of formation and gas suction through degassing wells. In this case, the injection wells are drilled into contour part of column. Moreover, sealing of injection wells is carried out for length of at least 20 m with length of injection section up to 5 m. Degassing boreholes are directed to middle part of column with the placement of trunks of degassing wells outside hydroprocessing zone.
EFFECT: technical result is to increase safety of working off gas-bearing coal seam.
1 cl, 1 dwg
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