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冰下药包法
当流冰面积较大且受阻滞流时,可在冰上作业进行冰下爆破。通常在冰上采用冰穿、铁铤、钢钎穿孔,或用小包炸药连续爆破开挖岀吊放炸药的冰洞。放在冰层下面进行破冰的药包,需作好防水处理,并系在绳索或木杆上,通过冰洞放人冰层下一定深度进行爆破
expl.
subglacial blasting
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