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为了解决无底柱分段崩落法的损失贫化较大的问题,数值模拟了崩落体的形态以及放矿过程中崩落体和放出体的形态演变过程。结果表明,崩落体形态接近于椭球缺,呈上宽下窄状,崩落体的宽度约为崩矿步距的1.2～1.5倍,但崩矿步距对崩落体的高度基本没有影响;放出体的形态也是近似椭球缺形,其演变规律表现为由初态的上宽下窄逐渐演变为上尖下宽,说明随放矿进行崩落体内矿石垂直流动性逐渐加强。研究中对不同步距下的放矿技术指标进行了统计分析,结果表明,放矿过程中,出矿口矿石品位是震荡式降低的,造成品位震荡降低的原因是少量正面废石的混入,而造成放矿截止的主要原因是顶部废石的大量混入。
In order to solve the problem of large loss and depletion of pillarless subsea caving method, the shape of caving body and the morphological evolution of caving body and body are numerically simulated. The results show that the shape of the caving body is close to the ellipsoid, and the shape of the caving body is wide and narrow. The width of the caving body is about 1.2-1.5 times of that of the caving step, but the collapse step has almost no effect on the height of the caving body. The shape of the body is also approximate ellipsoid-shaped, the evolution of the law shows that the initial width of the narrow gradually evolved into the upper tip wide under, indicating that with the ore caving ore vertical mobility gradually strengthened. In the study, statistical analysis was made on the ore-discharging technical indexes under different pitches. The results show that during the ore-dressing process, the grade of the ore at the ore outlet is reduced concussionally. The reason for the reduction of grade concussion is the mixing of a small amount of frontal waste rock, The main reason for the cut-off of the mine is the large amount of waste rock mixed in the top.