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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.
Aiming at the high efficiency mining technology research of 18 # sharp inclined thin vein of gold deposit in Gulianggouli gold mine, economic and technical comparison of 4 kinds of mining methods has been completed, and subsea column-free subsidence caving method of deep-hole blasting has been selected for mining.It is put forward that thin- Blasting and Efficient Mining Techniques Two key issues have been successfully implemented: the stability of extra-pulse acquisition engineering and the fabrication of thin-vein pulse blasting. The design uses two kinds of holes: “zigzag” and “quincunx” . According to the Kuznetsov formula and the Cunningham blasting index, the block size distribution of Rossing-Ramler (RR) of the corresponding blasting design parameters was calculated. The predicted average block size after blasting was about 10 cm. Based on FLAC3D, the stability of the extraneous quasi-engineering such as sectional transport laneway is analyzed. The results show that the stability of the quasi-quasi-entry engineering can be guaranteed when the extraneous transport laneway is located 6m away from the rock roadway.