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Two-dimensional discrete element simulation of the mechanical behavior and strain localization of anisotropic dense sands

机译：各向异性密集砂体力学行为的二维离散元素模拟

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摘要

This paper presents a microscopic investigation on the effects of initial anisotropy, drainage condition, and consolidation state on the mechanical behavior and strain localization of dense sands. Discrete element simulations with non-spherical clumps were carried out to simulate drained and undrained biaxial tests of isotropically and K-0 consolidated anisotropic sands. In drained tests, the stress-strain relationship shows an initial hardening and subsequent softening behavior, and the peak shear stress decreases as the bedding plane angle increases. K-0 consolidation has slight influence on the peak friction angle and does not affect the friction angle at zero dilatancy. In undrained tests, softening behavior occurs when the bedding plane angle is small, while for higher bedding plane angle, the strengthening response takes over. As the bedding plane angle increases, the peak friction angle decreases initially but increases afterwards. The relative displacement and rotation angle of clumps as well as the void ratio distribution within the specimen indicate the appearance of shear band. Shear bands leads to the inhomogeneous deformation field within specimens. Excessive dilation inside of shear band is produced, and it may induce re-contraction behavior under drained condition and may re-increase the pore water pressure under undrained condition. The appearance of shear band reduces the peak shear strength, and the specimen with a low bedding angle results in a larger reduction of shear strength than that from the specimen with a high bedding angle. Particle rotation mode and force chain network change along with the formation of a shear band. As the longest axis of clumped particle varies from vertical to parallel with respect to the loading direction, the majority of particle contacts inside of shear band changes from multi-point mode to single contact mode. The obtained shear band width and inclination angle were computed, and their variations with bedding angle were obtained.
机译：本文提出了对初始各向异性，排水条件和固结状态对致密砂的力学行为和应变定位的显微镜调查。进行具有非球形丛的离散元素模拟，以模拟各向同性和K-0固结各向异性砂的排出和不推进的双轴试验。在排水测试中，应力 - 应变关系显示初始硬化和随后的软化行为，并且随着床上用品角度增加而减小峰值剪切应力。 K-0固结对峰值摩擦角具有轻微影响，并且不会影响零膨胀率的摩擦角。在不介绍的测试中，当床上用品角度很小时，发生软化行为，而对于更高的床上用品角度，强化响应接管。随着垫片平面角度的增加，峰值摩擦角最初降低，但之后增加。丛块的相对位移和旋转角度以及样品内的空隙率分布表示剪切带的外观。剪切带导致样品中的不均匀变形场。产生剪切带内的过度扩张，并且可能在排出的情况下诱导重新收缩行为，并且可以在不推介的条件下重新增加孔隙水压力。剪切带的外观降低了峰值剪切强度，具有低床上用品角度的样品导致剪切强度的减小而不是具有高床上用品角度的试样。粒子旋转模式和力链网络随着剪切带的形成而变化。随着丛簇颗粒的最长轴从垂直于相对于加载方向平行而变化，大部分粒子接触剪切带内部从多点模式变为单个接触模式。计算所获得的剪切带宽和倾斜角，并且获得其与床上用品角度的变化。

著录项

  • 来源
    《Granular matter》 |2019年第2期|37.1-37.16|共16页
  • 作者

    Lue Xilin; Zeng Sheng; Li Liuchi; Qian Jiangu; Huang Maosong;

  • 作者单位

    Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China;

    CALTECH Dept Mech & Civil Engn Pasadena CA 91125 USA;

    Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China|Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 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

    Shear band; Dense sand; Anisotropy; Discrete element simulation; Undrained shear;

    机译：剪切带;致密的沙子;各向异性;离散元素模拟;未涂抹的剪切;

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