Anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction
The invention belongs to the technical field of coal mine gas extraction, and particularly relates to an anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction, which comprises the following steps of: firstly,...
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Format: | Patent |
Sprache: | chi ; eng |
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