椭球体放矿规律中的矿石接触力特性研究  

Characteristics of ore contact force in ellipsoid ore drawing law

作　　者：陈庆发 刘恩江 王少平 CHEN Qingfa;LIU Enjiang;WANG Shaoping(School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi 530004,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《采矿与安全工程学报》2021年第6期1210-1219,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金地区科学基金项目(51964003)。

摘　　要：为了解传统单漏斗放矿过程中散体介质体系内部微细观特性的变化、强化对传统单漏斗放矿过程中散体介质体系宏观流动特性的认识,基于颗粒离散元方法,构建传统单漏斗放矿试验模型,并结合接触力学及统计力学相关知识,对传统单漏斗放矿过程中由矿石颗粒组成的散体介质体系内部接触力概率分布密度、配位数、接触力分量比等参数进行量化研究。研究发现:随着放矿的进行,散体介质体系内部接触力集度变化规律不尽相同;放矿过程中不同类型接触力强度概率分布呈现出相似的变化规律,均呈指数形式衰减,且不同放矿节点条件下接触力强度分布规律也高度相似;散体介质体系内部总接触力分量比与强接触分量比均小于0,表明放矿过程中散体介质体系内部接触力网络的方向始终偏向铅锤方向;放矿前中期,法向接触力主要集中在铅锤方向,随着放矿的不断进行,与水平方向夹角为45°的法向接触力逐渐增加,接触力分布的主方向由一个变为多个,各向异性程度an的值也逐渐增大。研究成果强化了对单漏斗放矿过程中散体介质体系宏观流动规律的认识。In order to understand changes of micro characteristics in granular medium system, and to strengthen the understanding of macro flow characteristics of granular medium system during traditional single funnel ore drawing process, the traditional single funnel ore drawing test model was constructed based on discrete element method. In combination with knowledge of contact mechanics and statistical mechanics, such parameters as probability distribution density, coordination number, and component ratio of contact force in ore particle system were quantitatively studied during the process. The results have shown that the change law of contact force concentration in granular medium system varies with the development of ore drawing. The probability distributions of contact forces in different types show a similar variation law during ore drawing, all of which decay exponentially, and distributions of contact force strength are also highly similar in different ore drawing nodes. Total contact force component ratio and strong contact component ratio in granular medium system are both less than 0, indicating that contact force network in granular medium system is always towards the direction of perpendicular during ore drawing. In the early and middle stage of ore drawing, normal contact force is mainly concentrated in the plumb direction;while as ore drawing goes on, normal contact force with a horizontal angle of 45° increases gradually, and main direction of contact force distribution changes from one to multiple. The degree of anisotropy an also increases gradually. The research results strengthen the understanding of macroscopic flow law of granular medium system in the single funnel ore drawing process.

关 键 词：椭球体放矿规律 散体介质 接触力 量化研究 

分 类 号：TD853[矿业工程—金属矿开采]