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辅助掏槽炮孔
expl.
pony cut
辅助掏槽炮孔
只用掏槽孔爆不出足够大的新自由面时,可在掏槽孔的近旁钻凿辅助炮孔,并在掏槽孔之后爆破,以扩大掏槽面积,为周边炮孔创造良好的爆破条件
expl.
cut spreader hole
;
cut easer holes
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