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矿渣类颗粒介质结构对力链发展规律的影响

陆敏凤 唐朝晖 柴波 宁可 祝洁雯 方熠

陆敏凤, 唐朝晖, 柴波, 宁可, 祝洁雯, 方熠. 矿渣类颗粒介质结构对力链发展规律的影响[J]. 地质科技通报, 2022, 41(4): 274-281. doi: 10.19509/j.cnki.dzkq.2022.0094
引用本文: 陆敏凤, 唐朝晖, 柴波, 宁可, 祝洁雯, 方熠. 矿渣类颗粒介质结构对力链发展规律的影响[J]. 地质科技通报, 2022, 41(4): 274-281. doi: 10.19509/j.cnki.dzkq.2022.0094
Lu Minfeng, Tang Zhaohui, Chai Bo, Ning Ke, Zhu Jiewen, Fang Yi. Granule structure influences on force chain development in the slag medium[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 274-281. doi: 10.19509/j.cnki.dzkq.2022.0094
Citation: Lu Minfeng, Tang Zhaohui, Chai Bo, Ning Ke, Zhu Jiewen, Fang Yi. Granule structure influences on force chain development in the slag medium[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 274-281. doi: 10.19509/j.cnki.dzkq.2022.0094

矿渣类颗粒介质结构对力链发展规律的影响

doi: 10.19509/j.cnki.dzkq.2022.0094
基金项目: 

国家自然科学基金项目 41877253

详细信息
    作者简介:

    陆敏凤(1996-), 女, 现正攻读土木工程专业硕士学位, 主要从事地质环境评价方面的研究工作。E-mail: 1984487477@qq.com

    通讯作者:

    唐朝晖(1964-), 女, 教授, 主要从事工程地质与环境岩土工程方面的教学科研工作。E-mail: zhtang@cug.edu.cn

  • 中图分类号: P642.2

Granule structure influences on force chain development in the slag medium

  • 摘要:

    矿业活动产生的渣体是不规则颗粒介质, 具有级配复杂、结构不稳定的特征, 颗粒间通过力链传递应力。以典型铜矿渣为研究对象, 借助CT扫描技术获得矿渣的颗粒结构形态, 通过开展不同粗颗粒含量的平面压缩试验和数值模拟试验, 得到宏观力学变形曲线及力链发展过程和颗粒结构变化, 讨论颗粒结构和力链发展协同作用对宏观力学性质的影响机制, 以及颗粒介质材料压缩发展规律。结果表明: 矿渣类颗粒介质材料的力链发展方向与压力方向一致; 矿渣宏观抗压性能随>5 mm粗颗粒含量的增加先增后减, 在最优粗细颗粒配比50%处达到最大抗压强度; 颗粒结构和力链间软硬结构存在显著的协同演化; 压缩过程中内部存在快速压密、颗粒破碎和稳定压缩3个阶段。在矿渣堆填过程中, 除控制其粗颗粒在最优级配外, 保持均匀填筑和合理的压实使其进入稳定压缩阶段也非常重要。

     

  • 图 1  铜矿渣样品颗粒级配曲线

    Figure 1.  Particle size distribution curve of copper slag sample

    图 2  CT扫描仪及放入CT扫描仪的铜矿渣样品

    Figure 2.  CT scanner and the scanning copper slag sample

    图 3  压缩试验设计图

    Figure 3.  Compression test design chart

    图 4  压缩试验安装图

    Figure 4.  Installation of compression test

    图 5  封注红色染料的脆性玻璃珠

    Figure 5.  Brittle glass beads sealed with red dye

    图 6  铜矿渣压缩参数标定初始模型图

    Figure 6.  Initial model diagram of parameter calibration for numerical compression test of copper slag

    图 7  获取铜矿渣颗粒结构形态

    球形度S=dn/dw(dn为颗粒最大内切圆直径; dw为颗粒最小外接圆直径);长宽比:F=dmax/dmin (dmax为颗粒最长直径;dmin为以dmax长轴且与颗粒面积相等的椭圆短轴);圆形度R=L/2(πA)1/2(L为颗粒投影周长;A为颗粒投影面积)

    Figure 7.  Approach to measuring structural morphology of copper slag particle

    图 8  压缩试验下不同w5铜矿渣应力-应变曲线图

    Figure 8.  Stress-strain curves of copper slags with different w5 contents under the compression test

    图 9  不同w5铜矿渣应变-时间曲线及各阶段每组玻璃珠破碎数量

    Figure 9.  Strain-time curves of copper slags with different mass fractions w5 and the broken number of glass beads in each group at each stage

    图 10  不同w5铜矿渣玻璃珠破碎顺序及位置图

    图中数字为破碎玻璃珠编号

    Figure 10.  Broken sequences and position diagrams of glass beads incopper slags with different w5 contents

    图 11  铜矿渣压缩室内试验和模拟试验应力-应变曲线图

    Figure 11.  Stress-strain curves of indoor compression and corresponding simulation testsof copper slag

    图 12  w5=50%时模拟试验的应力链发展趋势图

    Figure 12.  Evolution trend diagram of the stress chain in the simulation test when w5=50%

    图 13  不同粗颗粒质量分数含量控制下矿渣颗粒结构变化

    Figure 13.  Changes of the slag granule structure under the control of the coarse particle content

    图 14  不同w5铜矿渣玻璃珠第一颗破碎时间及总破碎率复合图

    Figure 14.  Composite diagram of the first crushing timings and total crushing rates of glass beads in copper slags with different w5 contents

    图 15  模拟过程颗粒变形破碎情况

    Figure 15.  Simulation of particle deformation and crushing under compression process

    表  1  铜矿渣的级配参数表

    Table  1.   Gradation parameter of copper slag

    名称 d10/mm d30/mm d60/mm Cu=d60/d10 Cc=d302/(d10d60) 平均粒径d50/mm 粗颗粒w5/%
    铜矿渣颗粒级配 0.47 1.27 3.84 8.17 0.89 2.98 30.15
    注:定义粒径>5 mm的颗粒为粗颗粒,粗颗粒质量分数用w5表示;d10为小于该粒径的土颗粒的质量占土颗粒总质量的10%,也称有效粒径;d30为小于该粒径的土颗粒的质量占土颗粒总质量的30%,也称连续粒径;d60为小于该粒径的土颗粒的质量占土颗粒总质量的60%,也称控制粒径
    下载: 导出CSV

    表  2  铜矿渣6组优势外形轮廓几何参数统计表

    Table  2.   Statistical table of geometric parameters of six groups of dominant profiles of copper slags

    分类 1 2 3 4 5 6
    优势外轮廓
    球形度S 0.29 0.60 0.65 0.52 0.69 0.33
    长宽比F 5.96 3.31 3.16 3.85 3.63 5.62
    圆形度R 1.22 1.10 1.02 1.07 1.08 1.05
    下载: 导出CSV

    表  3  铜矿渣大型压缩试验参数反演标定

    Table  3.   Parameter inversion calibration table for the large-scale compression test of copper slag

    参数类型 标定值
    颗粒密度ρ/(kg·m-3) 2 608
    接触颗粒间弹性模量Ec/Pa 2×107
    法向切向刚度比k 1.05
    接触摩擦系数μ 0.3
    平行黏结弹性模量Ep/Pa 6.5×107
    平行黏结刚度比kp 1.05
    平行黏结抗拉强度σc/Pa 0.9×107
    平行黏结内聚力c/Pa 4.5×107
    下载: 导出CSV
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  • 收稿日期:  2021-04-28
  • 网络出版日期:  2022-09-07

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