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| 初钻孔 | |||
| 超深; 超钻又称超钻。在分段爆破底板计划崩落水平以下钻出的炮孔长度。由于分段底的约束较大，有必要在分段底板下钻孔以装填较多炸药作为底部装药。参见 over-drilling depth； subgrade, excess drilling | |||
| 向下钻进; 先钻; 钻孔加深; 底钻; 初钻; 超钻; 铆接初钻; 试钻 | |||
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| 先钻; 预钻; 超钻; 底钻; 把孔钻到一定大小以便用铰刀精加工 | |||
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