This paper describes the effects of bottom water cushion on long hole blasting.
本文论述了水垫层在深孔爆破中的作用。
The test results indicate that long hole blasting in the crossing hole can improve the suction quantity of firedamp effectively.
理论研究和试验都表明 ，采用爆破方法可以增加瓦斯?。
The principle of increasing gas emission rate by long hole blasting in the crossing hole is discussed. The radius cracked zone in coal seam caused by long hole blasting is calculated.
简要论述了深孔爆破提高瓦斯抽放的机理，以煤体中柱状装药爆炸后的裂隙圈半径进行了计算。
A new technique of the long-hole blasting has been used in raising and prospecting of the rooms and the pillars.
一次钻孔分段爆破的新工艺已成功地应用到天井掘进和矿房、矿柱的回采方面。
The parameters and layout of linear shaped charge, and the hole-pattern parameters, charging structure and priming method for long-hole blasting were discussed.
讨论了线形聚能装药的参数、设置方法以及深孔爆破的布孔参数、装药结构、起爆方法。
On these grounds, it is confirmed that the general blasting scheme of combining the long-hole and short-hole blasting with water-pressure blasting should be adopted so as to realize the design idea.
据此提出完成这一设计思想应采取深孔爆破、水压爆破及浅眼爆破相结合的最佳方案。
The technical requirements adopted for open long-hole blasting and its insurance countermeasures were put forward by summarizing the blasting operation during exploiting the Tunqiu Mine of Liugang.
通过对柳钢屯秋矿开采中的爆破工作进行总结研究，提出采用露天开采深孔爆破的技术条件与安全保障措施。
The blasting boulder yield is an important quality indicators in the step long-hole blasting of surface mine.
大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
In step long-hole blasting in gently inclined open-mine, which mining along slope direction from top to bottom, the press from next step result great difficult in blasting work.
张店钢铁总厂湖田石矿为缓倾斜露天矿，在由上而下顺倾向采矿的缓倾斜台阶深孔爆破中，下一台阶对爆区有夹制作用，给爆破工作带来很大难度。
In this paper, basic tests on the mechanism of bunch-long-hole blasting are outlined, calculation and selection of blasting parameters, and its application t...
笔者简要地介绍了束状深孔爆破机理的基础实验、爆破参数的选取及爆破技术的实施，并对爆破效果进行了分析。
In this paper, basic tests on the mechanism of bunch-long-hole blasting are outlined, calculation and selection of blasting parameters, and its application t...
笔者简要地介绍了束状深孔爆破机理的基础实验、爆破参数的选取及爆破技术的实施，并对爆破效果进行了分析。
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