The blasting boulder yield is an important quality indicators in the step long-holeblasting 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。
2
A new technique of the long-holeblasting 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。
3
The parameters and layout of linear shaped charge, and the hole-pattern parameters, charging structure and priming method for long-holeblasting were discussed.