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How contact stiffness and density determine stress-dependent elastic moduli: a micromechanics approach

机译：接触刚度和密度如何确定应力相关的弹性模量：一种微力学方法

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摘要

To investigate the origin of the stress-level dependency of soil elasticity, a series of stress-path experiments were simulated for loose and dense soil specimens with three different contact surfaces. In the discrete element analyses, an assumption was introduced in which the contact body had the geometry of an elastic sphere with local, axi-symmetric irregularity. To evaluate the cross-anisotropic elastic shear moduli, small-strain cyclic shear tests were simulated under stress conditions along four stress-probing paths. For dense specimens with high coordination numbers, the internal structure was represented by the degree of fabric anisotropy and the coordination number remained unchanged during shearing, thus leading to the coincidence of the sum of the exponents in the contact stiffness model. For the loose specimens with low coordination numbers, the fabric structure evolved continuously during shearing, which resulted in the increase of the exponents in the power function of the elastic modulus. The rearrangement of particles and the transition of contact-force chains, along with the evolution of the fabric, manifested as increasing dependency of the elastic moduli on the stresses in such loose specimens.
机译：为了研究土壤弹性的应力水平依赖性的起源，针对具有三个不同接触面的松散和致密的土壤样本进行了一系列应力路径实验，以进行模拟。在离散元素分析中，引入了一种假设，其中接触体具有局部局部，轴对称不规则性的弹性球体的几何形状。为了评估横观各向异性的弹性剪切模量，在应力条件下沿着四个应力探测路径模拟了小应变循环剪切试验。对于具有高配位数的致密样品，其内部结构以织物的各向异性程度表示，并且在剪切过程中配位数保持不变，从而导致接触刚度模型中的指数总和一致。对于具有低配位数的松散试样，织物结构在剪切过程中会不断演化，从而导致弹性模量的幂函数指数增加。颗粒的重排和接触力链的过渡，以及织物的演变，表现为弹性模量越来越依赖于这种松散样品中的应力。

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  • 来源
    《Granular matter》 |2014年第1期|23-39|共17页
  • 作者

    Choong-Ki Chung; Eui-Ryong Jang; Sung-Ha Baek; Young-Hoon Jung;

  • 作者单位

    Department of Civil and Environmental Engineering, Seoul National University, Kwanak-gu, Seoul 151-744, Republic of Korea;

    Civil and Environmental Engineering and Design Group, Hyungdai Engineering and Construction Co., Ltd,Seoul 110-920, Republic of Korea;

    Department of Civil and Environmental Engineering, Seoul National University, Kwanak-gu, Seoul 151-744, Republic of Korea;

    Department of Civil Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-Gu,Yongin-Si, Gyeonggi-Do 446-401, Republic of Korea;

  • 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

    Elastic shear stiffness; Contact model; Coordination number; Anisotropy parameter; Small-strain cyclic test; Discrete element simulation;

    机译：弹性剪切刚度;接触模型;协调号;各向异性参数;小应变循环测试;离散元模拟;

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