矿体下盘岩石最佳开掘高度的确定  

Determination of Optimum Rock Excavating Height of Orebody Footwall During Sublevel Caving

作　　者：李元辉[1] 孙豁然[1] 刘炜[1] 刘兴国[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2004年第12期1187-1190,共4页Journal of Northeastern University(Natural Science)

基　　金：国家'十五'科技攻关项目(2001BA609A 22)

摘　　要：对应用无底柱分段崩落法开采矿床时的矿石损失过程进行了分析·在开采倾斜及缓倾斜矿体时,为改善因矿体倾角小而大量残留矿石的状况,可以通过采用开掘下盘部分岩石的方法,提高矿产资源的回收率·分析了矿体下盘倾角与下盘矿石残留量的关系,通过计算机模拟,得出了下盘岩石不同开掘高度与放出矿岩量的变化规律,随着开掘高度的增加,下盘矿石单位高度放出量相应减少,可按盈利总额最大原则确定出最佳开掘高度·在矿山生产实际中,下盘岩石最佳开掘高度随着矿产品价格和生产成本的波动而变化·研究结果表明:采用计算机模拟放矿过程,尤其是放矿控制方面,优于实验室物理模型放矿·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 is decreasing. 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.

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 

分 类 号：TD853.36[矿业工程—金属矿开采]