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open overhand stopes
expl.
无支护上向台阶采矿法
在井下无支护的情况下,从下向上采掘矿石时,应以水平或倾斜的方式顺序将矿石爆落。因此,炮孔的钻孔角度〈从水平到垂直〉也应随采掘方式而变化
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