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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Bibliographische Detailangaben
Hauptverfasser: ZHANG FENGWU, LONG GUANBO, WANG WENCHUN, ZHOU SHENGCAI, WANG CHANGXIU, SHEN DAFU, WANG LIAN, YU MUHUA, ZHOU DONGPING, HE XINGLING, GUO CHENYE, CHEN KUN
Format: Patent
Sprache:chi ; eng
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