基于代表性体积单元模型的矿石组分界面破碎特征  

Fracture Characteristics of Ore Components Interface Based on Representative Volume Unit Model

作　　者：蔡改贫[1,2] 郝书灏 余成 宣律伟 CAI Gaipin;HAO Shuhao;YU Cheng;XUAN Lyuwei(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Province Engineering Research Center for Mechanical and Electrical of Mining and Metallurgy,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学机电工程学院,江西赣州341000 [2]江西省矿冶机电工程技术研究中心,江西赣州341000

出　　处：《高压物理学报》2022年第3期191-201,共11页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(51464017);江西省重点研发计划(20181ACE50034)。

摘　　要：矿物组分的界面破碎特征一般指黏结界面在外部载荷作用下产生的应力、应变等,其对研究矿物组分解离、提高矿石破碎效率具有重要意义。针对矿石内部组分矿物聚集、有用矿物非均匀分布的特点,开展了岩石内部岩相分析实验和矿物界面原位加载实验,在此基础上,利用非线性、多尺度建模平台DIGIMAT构建符合组分矿物微观结构的代表性体积单元(RVE)模型,并通过DIGIMAT-ABAQUS耦合开展矿石RVE模型原位破碎模拟。结果表明:(1)黑钨矿石中有用矿物以颗粒状分布在矿石内部,主要分布在石英矿物内及其与硅质岩矿物黏结界面处;(2)不同组分黏结界面的力学性质存在差异,且与组成矿物的物理属性、形态特征等相关,石英-硅质岩界面的最小破碎应力(界面发生破坏时的应力)范围为1.1785~1.4826 GPa,石英-钨界面的最小破碎应力范围为1.3355~1.5420 GPa;(3)加载速率为0.010或0.005 kN/s时,矿石破碎峰值应力无明显变化,但其对矿石内部形变的影响较大,且加载速率为0.010 kN/s时,强化阶段应力易突然降低并不断波动;(4)原位载荷产生的破坏主要发生在载荷作用区域边界,且两组界面中石英矿物破碎力学性能参数大于钨矿物和硅质岩矿物,即界面组成矿物中石英矿物优先形成破坏。The fracture characteristic of mineral component interface refers to the stress,strain and other processes generated by the bonding interface under the action of external load.It is of great significance for studying the dissociation of component minerals and improving the efficiency of ore crushing.To further study the characteristics of mineral accumulation and non-uniform distribution of useful minerals in the ore,the internal rock facies analysis and the mineral interface in-situ loading experiments were carried out.Based on these two experiments,the non-linear,multi-scale modeling platform DIGIMAT was employed to construct the coincident group.The representative volume element(RVE)model of the mineral microstructure is divided,and the in-situ crushing simulation of the ore RVE model is carried out through the DIGIMAT-ABAQUS coupling.It is suggested by these results that:(1)The useful minerals in the studied wolframite ore are distributed in granular form inside the ore,mainly in the quartz mineral and the bonding interface with the siliceous rock mineral.(2)The mechanical properties of the bonding interface with different components are related to the physical properties and morphological characteristics of the constituent minerals.The minimum fracture stress range of the quartz-siliceous rock interface is 1.1785–1.4820 GPa,and the minimum fracture stress range of the quartz-tungsten interface is 1.3355–1.5420 GPa;(3)Although the peak stress of ore crushing has no obvious effect when the loading rate is 0.010 or 0.005 kN/s,it has a greater impact on the internal deformation of the ore.When the loading rate is 0.010 kN/s,the stress suddenly decreased and constantly fluctuated during the strengthening stage.(4)The damage caused by in-situ loading mainly occurs at the boundary of the loading area.The fracture mechanical characteristics of quartz minerals in the two sets of interfaces are greater than that of tungsten minerals and siliceous rock minerals.Quartz minerals in the interface composition minerals

关 键 词：矿物界面 代表性体积单元模型 破碎特征 岩相分析 

分 类 号：O347[理学—固体力学] TD912[理学—力学]