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Distinct element analysis of the microstructure evolution in granular soils under cyclic loading

机译：循环载荷下颗粒土的微观结构演化的明显元素分析

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摘要

Granular soils exhibit very complex macroscopic mechanical responses when subjected to cyclic loading. To enhance the understanding of the cyclic behaviors of granular soils and provide significant insights into the constitutive modelling, this paper investigates the microstructure and its evolution under cyclic loading using distinct element method (DEM). A series of cyclic triaxial tests in drained conditions were numerically carried out on the DEM specimens with two different initial relative densities. At particle scale, both the coordination number and contact fabric were investigated to study the microstructure evolution of the granular soils. The simulations indicate that the evolutions of coordination number and contact fabric are highly dependent on the relative density and cyclic mode. A threshold value for the fabric anisotropy exists under cyclic loading, and once the threshold is reached, the internal structure of the specimen tends to be unstable, and the critical coordination number is reached at the specimen failure. The contact normal fabric tensor is always coaxial with the stress tensor under cyclic loading regardless of the sand relative density and cyclic model. Although there is no unique relationship between the contact normal fabric and stress, a uniqueness relationship between strong contact fabric and stress can be observed.
机译：颗粒土壤在经受循环载荷时表现出非常复杂的宏观机械反应。为了增强对粒状土壤的循环行为的理解，并对本构型建模提供显着的见解，本文研究了不同元素法（DEM）循环载荷下的微观结构及其演化。在具有两种不同的初始相对密度的DEM标本上进行了一系列循环三轴试验。在颗粒量表中，研究了协调数和接触织物，以研究粒状土壤的微观结构演变。模拟表明协调数量和接触面料的演变高度依赖于相对密度和循环模式。在循环加载下存在织物各向异性的阈值，并且一旦达到阈值，样本的内部结构趋于不稳定，并且在样品失效时达到临界配位数量。无论砂相对密度和循环模型如何，触点正常织物张量始终与循环负载下的应力张量同轴。虽然接触正常织物和应力之间没有独特的关系，但是可以观察到强接触织物和应力之间的唯一关系。

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  • 来源
    《Granular matter》 |2019年第2期|39.1-39.16|共16页
  • 作者

    Jiang Mingjing; Zhang An; Li Tao;

  • 作者单位

    Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai Peoples R China|Tongji Univ Dept Geotech Engn Coll Civil Engn 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ State Key Lab Disaster Reduct Civil Engn Shanghai Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai Peoples R China|Tongji Univ Dept Geotech Engn Coll Civil Engn 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tianjin Univ Dept Civil Engn Tianjin Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Granular soils; Cyclic loading; Distinct element method; Coordination number; Fabric evolution;

    机译：粒状土壤;循环加载;明显的元素法;协调数量;结构演变;

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