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。