Quasi-static rheology of granular media using the static DEM

Meng, J; Huang, J; Sheng, D; Sloan, SW

Quasi-static rheology of granular media using the static DEM

Meng, J Huang, J Sheng, D

Sloan, SW

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Publisher:: ASCE-AMER SOC CIVIL ENGINEERS
Publication Type:: Journal Article
Citation:: International Journal of Geomechanics, 2017, 17, (11)
Issue Date:: 2017-11-01

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Field	Value	Language
dc.contributor.author	Meng, J
dc.contributor.author	Huang, J
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.contributor.author	Sloan, SW
dc.date.accessioned	2022-09-01T06:42:24Z
dc.date.available	2022-09-01T06:42:24Z
dc.date.issued	2017-11-01
dc.identifier.citation	International Journal of Geomechanics, 2017, 17, (11)
dc.identifier.issn	1532-3641
dc.identifier.issn	1943-5622
dc.identifier.uri	http://hdl.handle.net/10453/161197
dc.description.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.
dc.language	English
dc.publisher	ASCE-AMER SOC CIVIL ENGINEERS
dc.relation.ispartof	International Journal of Geomechanics
dc.relation.isbasedon	10.1061/(ASCE)GM.1943-5622.0001001
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	General Mathematics
dc.title	Quasi-static rheology of granular media using the static DEM
dc.type	Journal Article
utslib.citation.volume	17
utslib.for	0905 Civil Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
dc.date.updated	2022-09-01T06:42:18Z
pubs.issue	11
pubs.publication-status	Published
pubs.volume	17
utslib.citation.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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http://hdl.handle.net/10453/161197