船运铁精矿流态化模型试验的离散元数值模拟  

Discrete element numerical simulation of model experiments of iron concentrate ore fluidization during shipping

作　　者：周健[1,2] 杜强[1] 简琦薇[3] 李晨[4] 张智卿[1,5] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海工程技术大学机械工程学院,上海201620 [4]上海出入境检验检疫局,上海200135 [5]浙江树人大学城建学院,浙江杭州310015

出　　处：《河海大学学报（自然科学版）》2016年第3期219-225,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家公益性基金(201310065);国家自然科学基金(41272296);中国博士后科学基金(2013M541544)

摘　　要：采用离散元程序PFC3D对散装铁精矿在动力荷载作用下发生流态化的室内振动台模型试验进行数值模拟,从细观的角度研究铁精矿流态化的演化规律及内在机理。考虑流态化过程中的非饱和特性,利用微小颗粒模拟水团,通过设置黏结模型模拟矿粉颗粒间的基质吸力,实时观察流态化过程中铁精矿位移场、水颗粒迁移情况以及细观组构的变化和发展,并将数值模拟结果与室内模型试验进行对比分析。结果表明:铁精矿发生流态化的主要原因是水液面的上升;其细观机理为在动力荷载作用下,铁精矿细颗粒沿着粗颗粒孔隙向下运动和颗粒间水团汇集形成水膜后的向上迁移。The discrete element program PFC3 Dwas used for numerical simulation of a model experiment,which was carried out on an indoor vibration table,in order to study the fluidization of iron concentrate ore in bulk under dynamic loads. The evolution and internal mechanism of the iron concentrate ore fluidization was studied from a mesoscopic perspective. With consideration of the unsaturation during the fluidization process,the water was simulated with small granules and the matrix suction was simulated by setting a bond model between fine granules of ore. The change and development of the displacement field,water particle migration,and mesoscopic fabric were observed during the fluidization process. The results of numerical simulation were compared with those of the model experiment. It was found that the main cause of iron concentrate ore fluidization is the increase of the water level. The mesoscopic mechanisms of fluidization are as follows： under dynamic loads,the fine particles move downwards through the spaces between coarse particles,and the water between the particles that becomes water film flows upwards.

关 键 词：铁精矿 流态化 数值模拟 细观机理 离散元法 

分 类 号：P64[天文地球—地质矿产勘探]