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利用颗粒流的离散元法,对杨家坝铁矿无底柱分段崩落法在覆岩下放矿的崩落矿岩移动规律,以及矿石损失与贫化过程进行了数值模拟仿真。对3种放矿方案进行了模拟分析,得出3个漏斗口依次同时放矿,即第一放出口放出1/3矿岩时第二放出口开始放矿,在其放出1/3矿岩的同时启动第三放出口放矿,并依次向后递推放矿的方案最优,采场工业验证试验贫化率为8%,损失率为9%,大大提高了企业的经济效益。
By using the discrete element method of particle flow, the numerical simulation of the movement of caving ore under the overburden caving method and the loss and depletion process of ore in the Yangjiaba iron ore pillarless subsidence caving is carried out. Three kinds of ore-dressing programs were simulated and analyzed. It was concluded that the three funnel mouths were put in the same place in turn, that is, when the first outlet let out 1/3 ore rock, the second outlet began to release ore and released 1/3 ore rock At the same time start the third release of the ore release, and in turn recuperation ore mining program optimal stope industrial verification test depletion rate of 8%, the loss rate of 9%, greatly improving the economic efficiency of enterprises.