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Deformation of Granular Material under Continuous Rotation of Stress Principal Axes

Journal Article · · International Journal of Geomechanics
 [1];  [2];  [1];  [3]
  1. Tsinghua Univ., Beijing (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Davis, CA (United States); National Technical Univ. of Athens, Athens (Greece)
The mechanical response of granular material to the rotation of stress principal axes is an issue of both practical and theoretical importance in soil mechanics. This study used a two-dimensional (2D) discrete-element method (DEM) simulation to investigate the deformation of granular material under the continuous rotation of stress principal axes while maintaining fixed principal stress values. The results show that under such rotation, the deformation can exceed that caused by fixed principal stress axes cyclic biaxial compression with a maximum deviatoric stress ratio that equals the fixed stress ratio during rotation. The volumetric strain was found to be contractive overall while oscillating within each load cycle for specimens with significant fabric anisotropy. Here, the initial fabric-anisotropy orientation was found to have little influence on the overall evolution of volumetric strain, although it was found to affect the development of shear strain. During the cycles of rotation of initial stress principal axes, the dilatancy of granular material, in the contractive direction, was found to be dominated by the evolving orientation of the major principal stress axis in reference to the initial major principal stress axis during anisotropic consolidation, and the influence of the initial fabric-anisotropy orientation was found to be trivial. As stress rotation continued, the influence of the relative orientation between stress and fabric became prominent, causing the material to dilate when the major principal stress axis rotated from the normal of the bedding plane to being perpendicular to it and causing contraction during the other half of the cycle.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1559916
Report Number(s):
LLNL-JRNL--744427; 899232
Journal Information:
International Journal of Geomechanics, Journal Name: International Journal of Geomechanics Journal Issue: 4 Vol. 19; ISSN 1532-3641
Publisher:
American Society of Civil EngineersCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

3D DEM simulation of principal stress rotation in different planes of cross‐anisotropic granular materials
  • Xue, Long; Kruyt, Niels P.; Wang, Rui
  • International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 43, Issue 14 https://doi.org/10.1002/nag.2945
journal July 2019
Two-dimensional discrete element simulation of the mechanical behavior and strain localization of anisotropic dense sands journal April 2019

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