Attempt is made here to review the rock blast models in a concise manner and show some tendencies of this study in the future.

对岩石爆破模型作了简要评述，就岩石爆破模型的发展趋势提出了初步看法。

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The development of the research on the rock blast models at home and abroad is presented, then concept of rock blast models is described.

系统综述了岩石爆破模型的国内外研究现状，阐明了其基本思想。

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The results indicate that the variation of ultrasonic velocity can reflect the damage degree of rock well, and the damage properties of rock can provide basis for the design of rock blast.

结果表明，岩石超声波速的变化可以很好地反映岩石的损伤程度，得出的岩石的损伤特性可以为岩石的爆破设计提供依据。

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Its miners blast and clear roughly six square metres (64.6 square feet) of rock, per man, per month.

ECONOMIST: South African gold mining