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为确定四方金矿17m×20m结构参数下的最优崩矿步距,在实验室开展相似物理实验,通过端部放矿实验测定放出体形态参数,在此基础上建立回贫差计算模型,确定理论上的最佳放矿步距为5m。为减小数学分析法的误差,选取4,4.5,5,5.5 m等4个放矿步距开展多进路放矿实验,以回贫差作为放矿效果的评判依据,确定最佳放矿步距为4.5m。考虑挤压爆破条件下的矿石松散系数为1.3~1.4,最终确定四方金矿17m×20m结构参数下的最佳崩矿步距在3.2~3.5m之间。
In order to determine the optimal collapse step size under the 17m × 20m structural parameters of Sifang Gold Mine, similar physical experiments were carried out in the laboratory, the shape parameters of the discharged body were determined by end-draining experiments, Determine the theoretically the best pick and place step is 5m. In order to reduce the error of mathematical analysis method, four ore-drafting steps of 4,4.5,5,5.5 m were chosen to carry out multi-channel ore-dressing experiment, Step is 4.5m. Considering that the loose coefficient of the ore under the conditions of extrusion blasting is 1.3-1.4, the optimal collapse step distance of the Sifang gold deposit under the 17m × 20m structure parameter is finally determined to be between 3.2 and 3.5m.