摘要
为了研究原地浸矿对离子型稀土矿抗剪强度的影响,进行了室内柱浸实验和直剪实验,分析了浸矿过程中颗粒级配与抗剪强度的变化规律。应用分形理论,对浸矿前、浸矿35d、浸矿70d土体的颗粒级配变化进行定量描述,分析了土体颗粒级配变化对抗剪强度的影响,并探究了分形维数与抗剪强度参数之间的关系。结果表明:由于浸矿过程中离子交换使得土体颗粒发生破坏,土体骨架崩解,细小颗粒所占比重增多;土体的抗剪强度整体呈下降趋势,其中内摩擦角持续减小,下降幅度16%左右;粘聚力下降幅度较大,大致浸矿35d后下降幅度达90%,之后趋于稳定;分形理论对于颗粒级配、抗剪强度参数的表征效果较好,为复杂无序系统的细观结构的层次性和相关性的分析提供了一种新的思路。
In order to study the effect of in-situ leaching on shear strength of ion-absorbed rare earth deposit, an indoor column leaching test and a straight-shear test were carried out to analyze the variation law of particle size distribution and shear strength during ore leaching. Based on fractal theory, the changes of the particle size distribution were quantified respectively for the soil bodies before leaching, as well as under 35 days and 70 days of leaching. Then, the effects of soil particle change on shear strength were studied, and the relationship between fractal dimension and shear strength parameters was investigated. It was concluded as follows. Firstly, because ion exchange led to the break of soil particles and disintegration of soiI skeleton during ore leaching, the percentage of powder particles increased. Secondly, the shear strength of soil showed an overall downward trend, and the angle of internal friction continued to decrease, with a falling range of about 16~. Thirdly, the decrease rate of cohesion was great at first and reached to 90 ~ after 35 days of leaching, then tended to be stable. Finally, the fractal theory had a good characterization effect on particle size distribution and shear strength parameters. The study provided a new idea for the analysis of the hierarchy and correlation of the macroscopic structure in complex and disorder systems.
作者
饶运章
姜福川
陈金龙
喻彪
RAO Yunzhang;JIANG Fuchuan;CHEN Jinlong;YU Biao(School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000,China;School of Architectural and Surveying ＆ Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China)
出处
《矿业研究与开发》
CAS
北大核心
2018年第4期35-39,共5页
Mining Research and Development
基金
国家863发展计划项目(2012AA061901)
2011年度江西省安全生产重大课题(JXAJ2011002)
关键词
离子型稀土矿
抗剪强度
颗粒粒径
颗粒级配
分形理论
Ion-absorbed rare earth deposits, Shear strength, Particle size, Particle size distribution, Fractal theory
