The reasonable hole pattern of deephole blasting was utilized to make fully use of the explosive energy to improve the crushed ratio to lower the boulder yield and to obtain better dam rocks.

深孔爆破采用合理的布孔方式，使炸药爆炸能量得以充分发挥，破碎率提高，大块度降低，从而获得较理想的堆石坝石料。

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To lower blasted boulder yield is one of the most important technical considerations in deep-hole blasting operations of mine.

降低深孔爆破落矿大块率是矿山凿岩中的一个重要课题。

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How to lower the blasted Boulder yield is an important problem in rock's blasting excavation and ore's drilling blasting.

降低爆破大块率是岩石爆破开挖和矿岩凿岩爆破中的一个重要课题。

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