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前探炮孔
该词有多种意义。如在平巷掘进中,最靠近掏槽孔的、用于刷大掏槽所形成的空间的炮孔, 为主爆破起爆的药包减少或排除部分覆土而装药和引爆的炮孔, 在紧靠拒爆炮孔钻出的炮孔,起爆时可能诱发或移去拒爆炮孔内的炸药。参见 satellite ;easer hole
expl.
relief hole
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