露天矿层状岩体爆破抛掷方向及参数优化

为了优化爆破参数，探究了露天矿层状岩体倾向与爆破抛掷方向之间的关系。以黄麦岭露天矿山为例，进行现场单孔爆破漏斗试验，然后统计爆破后的大块和飞石，绘制爆破漏斗剖面图。最后进行孔网参数的正交试验研究，应用Split-desktop软件记录爆破后的块度分布，确定了最优方案。研究表明，当爆堆抛掷方向与岩层倾向垂直时爆破效果最好。矿石/易爆岩石以及难爆岩石的最优孔网参数分别为5.5 m×3.7 m，5 m×3.5 m。研究成果为露天矿中深孔台阶爆破提供了科学依据。

Blasting Throwing Direction of the Layered Rock in Open-pit Mine and its Parameter Optimization

The relationship between rock dip and blasting throwing direction of the layered rock in open-pit mine was explored to optimize the blasting parameters.Taking Huangmailing Open-pit Mine as an example，single-hole blasting crater experiment in field was carried on.Then，the blasting crater profile was drawn by recording large blocks and flying rocks after blasting.Finally，the paper made the orthogonal test of spacing pattern parameters to determine the optimal solution with the application of the Split-desktop software for recording fragment distribution after blasting.The research indicated that the blasting effect is the best when the throwing direction of rock piles is vertical to the rock dip.The best spacing pattern parameters of the ore/explored rock and hard rock is 5.5 m×3.7 m，5 m×3.5 m respectively.The research provides a scientific basis for moderate longhole bench blasting in open-pit mine.