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。
It is known from cost analysis that key measure for control of blasting cost is to reduce the fines ratio.
通过成本分析得知，控制爆破成本的主要措施是降低粉矿率。
This paper summarizes the factors that affect lump coal ratio of coal faces in an all round way and discusses emphatically the blasting parameters and techniques of enhancing lump coal ratio.
全面总结了影响炮采工作面块煤率因素，并着重讨论了提高块煤率的爆破参数与技术。
Flying rock accident accounts for a great ratio of blasting accidents in open stone pits, which poses serious threat to safe production in mining area.
在诸多露天采场爆破事故中，飞石事故占很大的比率，对矿区的安全生产构成了严重威胁。
Sensitivity analysis method of the factors impact of blasting vibration characteristic parameters based on non-correspond ratio of rough set theory is put forward.
文章介绍了粗糙集理论不协调率的概念以及在敏感性分析中的应用，论述了基于粗糙集理论不协调率的影响爆破振动特征参量因素的敏感性分析方法。
To increase lump coal ratio in stopes, a scheme is put forward for coal falling by loose pre-shearing millisecond blasting, and hole arrangement parameters and blasting parameters are adjusted.
为提高炮采面块煤率 ，提出了松动预裂微差爆破的落煤方案 ，并对布孔参数和爆破参数进行了调整。
The results show that the apparent density of hard elastic polypropylene increases with a lower melt temperature, or a higher draft ratio, or a higher air blasting speed.
结果表明，熔体温度下降、所受拉伸比增加或冷却风速度升高均可使表观密度增加。
In the mining system which conveys ore by blasting force, the ratio of mined tonnage to development is low and the ore dilution and loss are less, leading to good cost effectiveness.
爆力运矿采矿法具有采切比小、矿石损失贫化少、 经济效益好等优点。
In the mining system which conveys ore by blasting force, the ratio of mined tonnage to development is low and the ore dilution and loss are less, leading to good cost effectiveness.
爆力运矿采矿法具有采切比小、矿石损失贫化少、 经济效益好等优点。
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