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Title: Deformation of Granular Material under Continuous Rotation of Stress Principal Axes

Abstract

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.more » 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.« less

Authors:
 [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)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1559916
Report Number(s):
LLNL-JRNL-744427
Journal ID: ISSN 1532-3641; 899232
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Geomechanics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 4; Journal ID: ISSN 1532-3641
Publisher:
American Society of Civil Engineers
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Granular material; Continuous stress principal axes rotation; Discrete element method; Deformation; Fabric

Citation Formats

Wang, Rui, Fu, Pengcheng, Zhang, Jian -Min, and Dafalias, Yannis F. Deformation of Granular Material under Continuous Rotation of Stress Principal Axes. United States: N. p., 2019. Web. doi:10.1061/(ASCE)GM.1943-5622.0001383.
Wang, Rui, Fu, Pengcheng, Zhang, Jian -Min, & Dafalias, Yannis F. Deformation of Granular Material under Continuous Rotation of Stress Principal Axes. United States. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001383
Wang, Rui, Fu, Pengcheng, Zhang, Jian -Min, and Dafalias, Yannis F. Thu . "Deformation of Granular Material under Continuous Rotation of Stress Principal Axes". United States. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001383. https://www.osti.gov/servlets/purl/1559916.
@article{osti_1559916,
title = {Deformation of Granular Material under Continuous Rotation of Stress Principal Axes},
author = {Wang, Rui and Fu, Pengcheng and Zhang, Jian -Min and Dafalias, Yannis F.},
abstractNote = {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.},
doi = {10.1061/(ASCE)GM.1943-5622.0001383},
journal = {International Journal of Geomechanics},
number = 4,
volume = 19,
place = {United States},
year = {Thu Feb 07 00:00:00 EST 2019},
month = {Thu Feb 07 00:00:00 EST 2019}
}

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Works referencing / citing this record:

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