blast hole [矿业] 爆破孔 ; 钻孔 ; 炮眼 ; 风洞
blast hole testing drill 牙轮钻头试验钻机
blast-hole springing 炮眼底扩大
blast hole drill 凿岩机 ; 爆破孔钻机
underground blast hole drilling 井下炮眼钻凿
blast hole pattern 炮孔布置图
blast-hole charge [矿业] 炮眼装药
Blast hole tricone rock bits 矿用三牙轮钻头
The blast tore a hole in the wall.
墙被炸开了个洞。
This paper describes the theory, features and testing results of the air reverse circulation drilling process used in geo physical blast hole drilling.
概述了空气反循环钻进工艺应用于物探爆破孔施工的原理、特点及其试验应用情况。
The mechanic affection on the blast hole walls is simply analysed and cracking propagation caused by shaped charge is explained in this paper.
简单分析了聚能爆破装药在孔内爆破的力学效应，阐明了聚能爆破对岩石定向破裂的控制机理。
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