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bum-out cut
expl.
线型掏槽
;
直孔掏槽
;
平行孔掏槽
掏槽的一种形式,主要特点是在开挖面的中央部位,垂直于开挖面钻凿若干空孔,在其周围平行钻凿一些装药的炮孔。爆破时,装药孔指向附近的空孔〈相当于临空面〉进行爆破掏槽
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