Quasi-Static Rheology of Granular Media Using the Static DEM
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VIEW THE REPLYPublication: International Journal of Geomechanics
Volume 17, Issue 11
Abstract
In contrast to the conventional discrete element method (DEM), no dynamic or damping variables are needed in the static DEM. This study aims at investigating the potential of the static DEM in modeling the quasi-static deformation of stiff granular materials, in which the conventional DEM performs poorly. To represent flexible boundary conditions in the static DEM, the variational formulation for the bonded particle approach is developed, and these formulations are implemented with two-dimensional numerical examples. The boundary conditions are of great importance in numerical simulations. Their effects on the mechanical behavior of granular media are studied at the particle scale. The results show that the force transmission from the boundary to the specimen is more efficient under the rigid boundary condition than under the flexible boundary condition. Finally, the quasi-static behavior of perfectly rigid granular media is investigated with biaxial numerical tests. The peak and residual strengths and strain localization are analyzed by varying the confining stresses and the rolling resistance coefficient. The numerical results are consistent with the common experimental observations in terms of macroscopic stress-strain response, volume-change behavior, strain localization, and force transmission. The macroscopic mechanical response of perfectly rigid particles is a hardening-softening plastic behavior governed by a Mohr-Coulomb yield function. It is also shown that the width of the shear band decreases significantly when the rolling resistance coefficient increases.
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Acknowledgments
The authors wish to acknowledge the support from the Australian Research Council Centre of Excellence for Geotechnical Science and Engineering and National Natural Science Foundation of China (Project No. 51679117). The first author wishes to acknowledge the support from the China Scholarship Council and University of Newcastle.
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International Journal of Geomechanics
Volume 17 • Issue 11 • November 2017
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© 2017 American Society of Civil Engineers.
History
Received: Dec 15, 2016
Accepted: May 23, 2017
Published online: Aug 17, 2017
Published in print: Nov 1, 2017
Discussion open until: Jan 17, 2018
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