METHOD OF DEVELOPMENT OF HIGH GAS BEARING COAL BEDS

摘要

FIELD: mining. ^ SUBSTANCE: invention refers to mining and can be employed at underground development of high gas bearing coal beds. When pair development entries are developed bores of big diameter are drilled from one of them through coal massif with their successive bridging from the side of a conveyer entry of a developed pillar. Number N of boreholes drilled in each coal massif is determined from the expression confirming ensured integrity of carrying capacity of the coal massif. Maintaining the said section of the conveyer entry with a face support beyond a mining face is carried out along the not more, than ¼ length of the coal massif ensuring exhaust of methane-air mixture from the mining face. While developing the pillar, as the mining face advances, exhaust of the flow from a supported section of entry into a ventilation entry of subject to extraction pillar is performed in three stages at each section between ventilation props and withdrawal flow of methane-air mixture via the said section of the conveyer entry. Each borehole is preliminary bridged off at executing each stage of exhausting methane-air mixture. Also simultaneously with exhaust of methane-air mixture a gas-drainage chamber is arranged. ^ EFFECT: increased efficiency and safety of development due to reduction of costs for maintaining not-cleared beyond mining face conveyer entry and due to improved mode of mining face ventilation. ^ 2 cl, 5 dwg