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。
The practice proves that given blasting technique can prominently raise the lump coal ratio and get a good economic benefit.
实践证明，文中所研究的爆破技术能较显著地提高块煤率，能取得较好的经济效益。
It is special important meaning that Deep - hole blasting With bottom Gap Charging is used to protect bottom rock from breaking, to decrease block ratio and to improve blasting efficiency.
深孔爆破孔底空隙装药在有效地保护底板岩层免遭破坏，减少大块率，提高爆破效率等方面均具有重要的意义。
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