基于爆破漏斗试验的爆破参数研究

Blasting Funnel Test based Blasting Parameters in a Mine

某金属矿山采矿方法由无底柱分段崩落法改为阶段崩落嗣后充填采矿法,为了设计与阶段嗣后充填采矿法相适应的爆破参数,展开了系列单孔漏斗试验、宽孔距同段爆破漏斗试验以及斜面台阶爆破试验。通过对数据统计分析得出下面结论,最佳埋深比:Δ=0.409;最佳单位炸药爆破体积:V/Q=0.386 1 m^3/kg;最佳爆破漏斗时炸药的单耗q=0.68 kg/t;孔间距为1.4 m;最小抵抗线的范围为0.85~0.90 m。在实际生产中采用80 m孔径的中深孔爆破时,孔间距为2.6 m;排距为1.61~1.71 m;爆破效果最好单耗小于0.68 kg/t。

A metal mine mining method is upgraded from a pillarless caving method to a stage of caving and then to a mining method. To design the blasting parameters which are compatible with the stage filling method, a series of single-hole funnel test, wide-hole blasting funnel test and slope step blasting test were carried out. The following conclusions are drawn through analyzing statistical data： the optimum blasting ratio is： V/Q = 0.386 1 m^3/kg; the best blowout of the explosive funnel q=0.68 kg/t; hole spacing is 1.4m; the minimum resistance line range is 0.85-0.90 m. In the actual production with 80 m aperture in the deep hole blasting： hole spacing of 2.6 m, row distance of 1.61- 1.71 m, blasting the best unit consumption is also less than 0.68 kg/t.