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爆破的炮孔密集系数
爆破孔间距与爆破最小抵抗线之比,决定着爆破碎岩效果。该系数的最佳值取决于钻孔布置形式〈矩形或交错〉、地质状况和定时方法
expl.
spacing
burden
ratio at blasting
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