急倾斜薄矿脉深孔落矿工艺参数优化

针对金厂沟梁金矿18#急倾斜薄矿脉开展高效采矿技术研究,完成了4种采矿方法的经济技术比较,优选深孔爆破的无底柱分段崩落法进行开采.提出薄矿脉深孔爆破高效采矿技术成功实施的两个关键问题:脉外采准工程稳定性和薄矿脉爆破夹制作用.设计采用"之字形"和"梅花形"两种布孔方式来克服爆破的夹制作用.依据库兹涅佐夫公式、坎宁安爆破指数计算了相应爆破设计参数的罗辛-拉姆勒(R-R)块度分布,预测爆破后的平均块度约为10 cm.基于FLAC3D分析了分段运输巷道等脉外采准工程的稳定性,结果表明,脉外运输巷道位于凿岩巷道6 m之外即可保证采准工程的稳定.

Deep Hole Blasting Parameters Optimization for Steeply Inclined Thin Vein

For the effective mining of the No. 18 steeply inclined thin vein in Inner Mongolia Jinchanggouliang Gold Mine, four mining methods were compared economically and technologically and the non-pillar sublevel caving method for deep hole blasting was selected. The key to the successful deep-hole blasting of thin veins is to maintain the stability of preliminary mining structures out of the veins and to overcome the confinement effect during the blasting of thin vein. Blastholes were arranged like "zigzag" and "quincunx", respectively, in order to overcome the confinement effect. The Rosin-Rammler distribution of fragment size after blasting was calculated by means of Kuznetsov formula and Cunningham blasting index. Moreover, based on the distribution model, the average fragment size was forecasted to be around 10 cm. The stability of the preliminary mining structures out of the veins, such as the sublevel haulage drift, was analyzed using FLAC^3D. The results show that, if the out-of-vein haulage drift is more than 6m away from the drilling drift, its stability can be assured.