关键词: 无底柱崩落法, 开掘高度, 下盘倾角, 岩石混入率, 矿石回收率

Abstract: Discusses the ore loss process during sublevel caving without pillars. In many cases, due to the limitation of the sloping or gently sloping orebody footwall, lots of ores will generally be left behind when drawing ores from each and every ring is stopped at shut-off point. To recover the residue, an efficient way is to excavate some waste rock of footwall. With the increase of the excavating height of footwall, the quantity of ores drawn in unit height decreases. The optimum rock excavating height of footwall is governed by the ore recovery and economy. The relationship between the ore residue from the footwall and the slope of footwall is studied by numerical simulation. In practice, the optimum excavating height of footwall changes in accordance with the mineral market price and mining cost. The study shows that the numerical simulation is more feasible than physical model experiment in simulating the drawing process, especially in drawing control.