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粒料固有各向异性的离散元模拟与细观分析

钱劲松 陈康为 张磊

钱劲松, 陈康为, 张磊. 粒料固有各向异性的离散元模拟与细观分析[J]. 力学学报, 2018, 50(5): 1041-1050. doi: 10.6052/0459-1879-18-061
引用本文: 钱劲松, 陈康为, 张磊. 粒料固有各向异性的离散元模拟与细观分析[J]. 力学学报, 2018, 50(5): 1041-1050. doi: 10.6052/0459-1879-18-061
Qian Jinsong, Chen Kangwei, Zhang Lei. SIMULATION AND MICRO-MECHANICS ANALYSIS OF INHERENT ANISOTROPY OF GRANULAR BY DISTINCT ELEMENT METHOD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1041-1050. doi: 10.6052/0459-1879-18-061
Citation: Qian Jinsong, Chen Kangwei, Zhang Lei. SIMULATION AND MICRO-MECHANICS ANALYSIS OF INHERENT ANISOTROPY OF GRANULAR BY DISTINCT ELEMENT METHOD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(5): 1041-1050. doi: 10.6052/0459-1879-18-061

粒料固有各向异性的离散元模拟与细观分析

doi: 10.6052/0459-1879-18-061
基金项目: 1) 中央高校基本科研业务费专项资金资助项目(22120170129).
详细信息
    作者简介:

    2) 钱劲松, 副教授, 主要研究方向: 交通岩土工程. E-mail: qianjs@tongji.edu.cn

    通讯作者:

    钱劲松

  • 中图分类号: TU441;

SIMULATION AND MICRO-MECHANICS ANALYSIS OF INHERENT ANISOTROPY OF GRANULAR BY DISTINCT ELEMENT METHOD

  • 摘要: 料在摊铺后形成的颗粒定向排列将导致其力学性质的固有各向异性. 依据粒料的实际不规则形状, 构建了可模拟粒间咬合嵌挤作用的三维离散元复杂形状颗粒; 生成了5 种不同沉积方向的各向异性试件和1种各向同性试件, 对比了各试件在三轴压缩试验中的宏观力学特性差异; 引入组构张量以量化各向异性程度, 利用玫瑰图表达接触法向与接触力的分布特征, 探究了粒料各向异性的细观发展规律. 结果表明: 颗粒长轴愈趋向水平排布, 峰值应力比愈大, 剪缩与剪胀程度愈明显; 相较于各向同性试件, 沉积角$\theta$为$0^\circ$时, 峰值应力比和最大体积压缩应变分别提高了12.6\%和18.8\%, 其原因在于加载过程中颗粒旋转和滑动百分比更小, 内部调整时间更短、更易被剪密; 固有各向异性对颗粒法向接触力分布的影响不大, 但显著影响接触法向分布特征; 剪切过程中, $\theta$为$90^\circ$时的接触法向各向异性系数先快速减小后逐渐增大, 而$\theta$为$0^\circ$到$60^\circ$时则呈现出增大后稍有回落或趋于稳定的趋势, 且$\theta$ 愈小的试件各向异性系数增大愈快.

     

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出版历程
  • 收稿日期:  2018-03-12
  • 刊出日期:  2018-09-18

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