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

机译：循环荷载下粒状土壤微观结构演化的不同元素分析

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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：当承受周期性载荷时，粒状土壤表现出非常复杂的宏观力学响应。为了增强对粒状土壤循环行为的理解，并为本构模型提供重要见解，本文使用独特元素方法（DEM）研究了循环荷载作用下的微观结构及其演变。在排水条件下，对具有两种不同初始相对密度的DEM样品进行了一系列的循环三轴试验。在颗粒尺度上，研究了配位数和接触织物，以研究颗粒状土壤的微观结构演变。仿真表明，配位数和接触结构的演变高度依赖于相对密度和循环模式。在循环载荷下存在织物各向异性的阈值，一旦达到该阈值，则样品的内部结构趋于不稳定，并且在样品破坏时达到临界配位数。在循环载荷下，接触法向织物张量始终与应力张量同轴，而与沙的相对密度和循环模型无关。尽管接触法向织物和应力之间没有唯一关系，但是可以观察到强接触织物与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;循环荷载;离散元法;配位数;织物演化;

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