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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第6期    总第310期    2020年6月

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文章编号:1672-7207(2020)06-1673-09
基于不均匀粒径分布的颗粒穿流特性
金爱兵1, 2,陈帅军1, 2,孙浩1, 2,赵怡晴1, 2,覃璇3,巨有1, 2,高艳华4

(1. 北京科技大学 土木与资源工程学院,北京,100083;
2. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京,100083;
3. 中国安全生产科学研究院,北京,100012;
4. 北京城市学院 城市建设学部,北京,100083
)

摘 要: 针对目前颗粒穿流研究中多基于均匀分布粒径矿岩颗粒的问题,采用物理试验和数值模拟相结合的方法,基于不均匀分布粒径颗粒,开展三维放矿模型试验和三维数值剪切试验,通过分析放矿前后相关粒径颗粒质量分数的变化和剪切过程中细颗粒的平均位移,研究不均匀粒径级配下颗粒的穿流特性。研究结果表明:在颗粒粒径分布不均匀的情况下,放矿高度对放出颗粒粒径组成无显著影响,且顶部标志小颗粒也未先于顶部标志颗粒放出,说明在垂直方向上颗粒的穿流效果不显著;放矿前颗粒的粒径分布对放出颗粒的粒径组成有显著影响,随着放矿前散体颗粒平均粒径增大,小颗粒的穿流量也快速增大,同时可穿流颗粒粒径也不断增大;随着不均匀散体平均粒径增大,细颗粒的穿流率也明显增大,说明散体颗粒的不均匀性对细颗粒穿流率的影响显著。

 

关键字: 崩落法;不均匀粒径;放矿模型试验;数值模拟;颗粒穿流率

Characteristics of particle percolation based on inhomogeneous particle size distribution
JIN Aibing1, 2, CHEN Shuaijun1, 2, SUN Hao1, 2, ZHAO Yiqing1, 2, QIN Xuan3, JU You1, 2, GAO Yanhua4

1. School of Civil and Resource Engineering, University of Science and Technology Beijing,Beijing 100083, China;
2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China;
3. China Academy of Safety Science and Technology, Beijing 100012, China;
4. Department of Urban Construction, Beijing City University, Beijing 100083, China

Abstract:Considering that current particle percolation studies are mostly based on uniformly distributed size of ore and rock particles, a three-dimensional ore draw model experiment and a three-dimensional numerical shear experiment were carried out by combining physical test and numerical simulation based on the inhomogeneous distribution of particle size. The changes of the mass fraction of related particle size before and after draw and the average displacement of fine particles in the shear process were analyzed, and the percolation characteristics of particles in inhomogeneous particle size distribution were studied. The results show that the draw height has no significant effect on the particle size composition of the ore draw in condition of inhomogeneous particle size distribution, and the top marked small particles do not draw before the top marked particles, which indicates that the percolation effect of particles in the vertical direction is not significant. The particle size distribution before draw has a significant effect on the particle size composition of the ore draw. With the increase of the average particle size before ore draw, the percolation flow of small particles increases rapidly, and the particle size of percolation particles increases. The percolation rate of fine particles increases with the increase of the median diameter of the inhomogeneous dispersion, which indicates that the heterogeneity of matrix particles has a significant effect on the flow rate of fine particles.

 

Key words: caving mining; inhomogeneous particle size; physical draw experiment; numerical simulation; particle percolation rate

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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