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Probing into the strain induced anisotropy of Hostun RF loose sand

机译：Hostun RF松散砂土的应变各向异性研究。

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摘要

Several recent linear drained preloading histories with fixed direction were especially designed to study the effects of strain induced anisotropy of loose Hostun RF sand in the compression side of the classical triaxial plane. Nearly identical void ratio and a same initial isotropic stress state prior to the final undrained shearing in compression are the requirements of the experimental program to take into account only the deviatoric strain histories. The effects of previous deviatoric strain histories on the undrained response of loose Hostun RF sand are identified: mainly the progressive transformation of a contractive and unstable behaviour of very loose sand into a dilative and stable behaviour of dense-like sand by previous linear drained history, while remaining in the same state of loose density. Experimental data evidence the directional dependency of the initial gradient of the effective stress paths, independent of the length of the approaching linear stress paths; the large common non linear effective stress response up to the deviatoric stress peak; the progressive appearance of the dilatancy domain and the unexpected evolution of the undrained behaviour of loose and presheared sand. The paper provides new insights into the mechanisms of strain induced anisotropy of loose sand created by simple linear triaxial stress paths from an isotropic stress state.
机译：特别设计了一些最近的具有固定方向的线性排水预压历史，以研究在经典三轴平面压缩侧的应变诱发各向异性的Hostun RF砂的各向异性。实验程序要求仅考虑偏斜应变历史，然后在压缩中最终不排水剪切之前具有几乎相同的空隙率和相同的初始各向同性应力状态。确定了以前的偏斜应变历史对松散Hostun RF砂的不排水响应的影响：主要是根据以前的线性排水历史，将非常松散的砂土的收缩和不稳定行为逐渐转变为致密状砂子的扩张和稳定行为，同时保持疏松状态不变。实验数据证明了有效应力路径初始坡度的方向依赖性，与线性应力路径的长度无关。直至偏应力峰值的大的通用非线性有效应力响应；膨胀区域的渐进出现以及疏松和预剪砂的不排水行为的意外演变。本文提供了从各向同性应力状态通过简单线性三轴应力路径产生的松散砂土应变诱发各向异性的机理的新见解。

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  • 来源
    《Granular matter》 |2012年第5期|p.589-605|共17页
  • 作者

    H. Hareb; T. Doanh;

  • 作者单位

    Ecole Nationale des Travaux Publics de l'Etat, DGCB-LGM, LTDS (UMR5513), 2 Rue M. Audin, 69518 Vaulx en Velin Cedex, France;

    Ecole Nationale des Travaux Publics de l'Etat, DGCB-LGM, LTDS (UMR5513), 2 Rue M. Audin, 69518 Vaulx en Velin Cedex, France;

  • 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

    induced anisotropy; strain history; elasticity; liquefaction; laboratory tests; sands;

    机译：诱发各向异性应变历史弹性;液化;实验室测试;金沙;

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