基于离散元理论的自然崩落法放矿细颗粒渗移过程研究

为探讨自然崩落法放矿过程中废石细颗粒的渗移规律及诱因，利用离散元软件EDEM分别从粗细颗粒数量比、直径比及矿岩含水率三个方面对细颗粒的渗移过程进行模拟，并设置标志颗粒对不同区域的相邻粗细颗粒进行跟踪。研究结果表明：放矿提前贫化率随粗细颗粒数量比的增大不断降低；废石细颗粒渗移速率随粗细颗粒直径比的增大而增大，且受含水率影响显著；相邻位置的细颗粒的渗移速度大于粗颗粒的下降速度。研究结果为进一步探讨矿石损失贫化、确定采场结构参数及优化放矿管理制度提供理论支持。

Discrete element method study on the percolation process of fine particles in ore drawing by the block caving method

To explore the percolation regulation and inducement of waste fine particles in ore drawing by the block caving method, a simulation is undertaken by using discrete element method software EDEM. This simulation contains coarse-to-fine particle amount ratio, diameter ratio and moisture content, and sets marker particles in different regions to trace the migration of adjacent coarse and fine particles. The results indicate that the ore-drawing advance dilution rate decreases with increasing coarse-to-fine particle amount ratio. The percolation rate of waste fine particles increases with increasing diameter ratio and is significantly affected by moisture content. Moreover, the percolation rate of fine particles is greater than the decline rate of adjacent coarse particles. The results provide a theoretical support for further studying and discussing the ore loss and dilution, determining the stope structure parameters and opti-mizing the ore drawing management system.