论文部分内容阅读
基于内蒙古某金矿实际地质条件及矿岩物理性质,采用颗粒离散元法,对急斜薄矿脉崩落矿岩散体的流动规律进行数值模拟研究。研究结果表明,其颗粒的运动模型可分为倾斜边壁控制区、过渡区及自由下落区;其力的传递模型可分为均匀接触力区、卸压区及不稳定力拱区。在此基础上分析了矿岩摩擦角的变化对放矿过程的影响,尤其是对放矿过程中贫化三角矿体的大小及颗粒间接触力的影响。分析结果表明:1)上下盘围岩的摩擦角δ与矿石散体的摩擦角φ之比越大,贫化三角矿体积越大;2)颗粒间摩擦角越大,则颗粒间接触力越大,放矿过程中不稳定力拱的产生与崩塌越频繁,越容易产生稳定拱。最终,根据所得研究结果,提出了优化采场结构参数,降低矿石损失贫化的方法。
Based on the actual geologic conditions of a certain gold deposit in Inner Mongolia and the physical properties of the rock and mineral, particle flow and dispersion method are used to study the numerical simulation of the flow of the cavern and caving coal mine. The results show that the particle motion model can be divided into inclined side wall control zone, transition zone and free fall zone. The force transfer model can be divided into uniform contact force zone, pressure relief zone and unstable force arch zone. On this basis, the influence of the variation of ore-rock friction angle on the ore-discharging process is analyzed, especially on the size of the lean triangular ore body and the contact force between the particles during the ore drawing process. The results show that: 1) the larger the ratio of the friction angle δ of the surrounding rock of the upper and lower plates to the friction angle φ of the ore dispersion, the larger the volume of the depleted triangular ore; and 2) the larger the inter-particle friction angle, Large, unstable ore in the process of producing and collapsing the more frequent collapse, the more likely to produce stable arch. Finally, based on the results of the study, a method of optimizing stope structure parameters and reducing ore loss and depletion is proposed.