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扩槽炮孔巷道掘进时，除掏槽孔、辅助掏槽孔、周边孔以外，将掏槽向周围横向扩大的炮孔
expl. wall hole
扩槽炮孔巷道掘进时，除掏槽孔、辅助掏槽孔、周边孔以外,将掏槽向周围横向扩大的炮孔。 wall hole
expl. stoping hole

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