Coal seam freezing type cross-drift coal uncovering method
The invention discloses a coal seam freezing type cross-drift coal uncovering method which comprises the following steps: a) arranging a drilling site in the position of a cross-drift operating surface of a tunnel being 5-7 meters away from a coal seam; b) drilling a plurality of cooling holes and t...
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Format: | Patent |
Sprache: | chi ; eng |
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