Critical State and the Loosest Jammed State of Granular Materials

He, X

Critical State and the Loosest Jammed State of Granular Materials

He, X

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Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Applied Sciences (Switzerland), 2023, 13, (3)
Issue Date:: 2023-02-01

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Field	Value	Language
dc.contributor.author	He, X https://orcid.org/0000-0001-5336-3663
dc.date.accessioned	2024-04-11T05:48:39Z
dc.date.available	2024-04-11T05:48:39Z
dc.date.issued	2023-02-01
dc.identifier.citation	Applied Sciences (Switzerland), 2023, 13, (3)
dc.identifier.issn	2076-3417
dc.identifier.issn	2076-3417
dc.identifier.uri	http://hdl.handle.net/10453/177740
dc.description.abstract	Solid-state (i.e., jammed) granular soils can be prepared into different densities characterised by the mean pressure (Formula presented.) and the solid fraction (Formula presented.) (i.e., different (Formula presented.) - (Formula presented.) combinations). The limits for jammed states (i.e., the range of possible (Formula presented.) - (Formula presented.) ) are studied theoretically in the literature or through isotropic compression simulations with the discrete element method (DEM). Shearing also causes unjamming and the critical state is an important reference state for shear deformation. How the jamming limits from isotropic compression tests are related to the critical state is examined in this paper by DEM simulations. Two methods are used to generate isotropic samples. One is the isotropic compression method, which is mainly used for studying jamming in the literature. Possible jammed states from this method lie between two compression lines. The varying-friction methods can generate samples with a larger range of (Formula presented.) - (Formula presented.). Isochoric shear tests are conducted on isotropic specimens prepared with both methods. Some specimens reach liquefaction ( (Formula presented.) 0) and the others reach the critical state. The obtained critical state (Formula presented.) - (Formula presented.) line is found to be the same as the loosest jammed state line from the isotropic compression method. Additionally, the critical state stress state is also well described by a Coulomb-type equation in the octahedral profile.
dc.language	English
dc.publisher	MDPI
dc.relation.ispartof	Applied Sciences (Switzerland)
dc.relation.isbasedon	10.3390/app13031361
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Critical State and the Loosest Jammed State of Granular Materials
dc.type	Journal Article
utslib.citation.volume	13
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
pubs.organisational-group	University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	open_access	*
dc.date.updated	2024-04-11T05:48:36Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	13
utslib.citation.issue	3

Abstract:

Solid-state (i.e., jammed) granular soils can be prepared into different densities characterised by the mean pressure (Formula presented.) and the solid fraction (Formula presented.) (i.e., different (Formula presented.) - (Formula presented.) combinations). The limits for jammed states (i.e., the range of possible (Formula presented.) - (Formula presented.) ) are studied theoretically in the literature or through isotropic compression simulations with the discrete element method (DEM). Shearing also causes unjamming and the critical state is an important reference state for shear deformation. How the jamming limits from isotropic compression tests are related to the critical state is examined in this paper by DEM simulations. Two methods are used to generate isotropic samples. One is the isotropic compression method, which is mainly used for studying jamming in the literature. Possible jammed states from this method lie between two compression lines. The varying-friction methods can generate samples with a larger range of (Formula presented.) - (Formula presented.). Isochoric shear tests are conducted on isotropic specimens prepared with both methods. Some specimens reach liquefaction ( (Formula presented.) 0) and the others reach the critical state. The obtained critical state (Formula presented.) - (Formula presented.) line is found to be the same as the loosest jammed state line from the isotropic compression method. Additionally, the critical state stress state is also well described by a Coulomb-type equation in the octahedral profile.

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http://hdl.handle.net/10453/177740