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无底柱分段崩落采矿法
在回采进路中用上向扇形中深孔或深孔和挤压爆破向松散矿岩崩落落矿步距内的矿石,落下矿石在崩落岩石覆盖下从回采进路端部的矿石堆中铲运矿石至溜井放至运输水平。放矿结束后进行下一个步距的落矿
expl.
sublevel caving without sill pillar
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