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Article: Influence of inter-particle friction on critical state behaviour

TitleInfluence of inter-particle friction on critical state behaviour
Authors
Issue Date2014
PublisherWiley.
Citation
International Journal for Numerical and Analytical Methods in Geomechanics, 2014, v. 38 n. 12, p. 1276-1297 How to Cite?
AbstractUnderstanding the extent to which discrete element method (DEM) simulations can capture the critical state characteristics of granular materials is important to legitimize the use of DEM in geomechanics. This paper documents a DEM study that considered the sensitivity of the critical state response characteristics to the coefficient of interparticle friction (μ) using samples with gradings that are representative of a real soil. Most of the features that are typically associated with sand behaviour at the critical state were seen to emerge from the DEM simulation data. An important deviation occurs when high μ values (μ  ≥ 0.5) are used, as has been the case in a number of prior DEM studies. While there is a systematic variation in the critical state behaviour with μ for μ  < 0.5, when μ ≥ 0.5, the behaviour at the critical state seems to be insensitive to further increases in μ. In contrast to observations of conventional soil response, when μ ≥ 0.5, the void ratio at the critical state initially increases with increasing mean effective stress (p′). Analysis of the DEM data and use of simple models of isolated force chains enabled some key observations. When ‘floating’ particles that do not transmit stress are eliminated from the void ratio calculation, the void ratio at the critical state decreases consistently with increasing p′. There is a transition from sliding to rolling behaviour at the contact points as μ increases. Beyond a limiting value of μ, further increases in μ do not increase the buckling resistance of individual strong force chains.
Persistent Identifierhttp://hdl.handle.net/10722/202647
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHUANG, Xen_US
dc.contributor.authorHanley, KJen_US
dc.contributor.authorO'Sullivan, Cen_US
dc.contributor.authorKwok, CYen_US
dc.date.accessioned2014-09-19T09:14:11Z-
dc.date.available2014-09-19T09:14:11Z-
dc.date.issued2014en_US
dc.identifier.citationInternational Journal for Numerical and Analytical Methods in Geomechanics, 2014, v. 38 n. 12, p. 1276-1297en_US
dc.identifier.urihttp://hdl.handle.net/10722/202647-
dc.description.abstractUnderstanding the extent to which discrete element method (DEM) simulations can capture the critical state characteristics of granular materials is important to legitimize the use of DEM in geomechanics. This paper documents a DEM study that considered the sensitivity of the critical state response characteristics to the coefficient of interparticle friction (μ) using samples with gradings that are representative of a real soil. Most of the features that are typically associated with sand behaviour at the critical state were seen to emerge from the DEM simulation data. An important deviation occurs when high μ values (μ  ≥ 0.5) are used, as has been the case in a number of prior DEM studies. While there is a systematic variation in the critical state behaviour with μ for μ  < 0.5, when μ ≥ 0.5, the behaviour at the critical state seems to be insensitive to further increases in μ. In contrast to observations of conventional soil response, when μ ≥ 0.5, the void ratio at the critical state initially increases with increasing mean effective stress (p′). Analysis of the DEM data and use of simple models of isolated force chains enabled some key observations. When ‘floating’ particles that do not transmit stress are eliminated from the void ratio calculation, the void ratio at the critical state decreases consistently with increasing p′. There is a transition from sliding to rolling behaviour at the contact points as μ increases. Beyond a limiting value of μ, further increases in μ do not increase the buckling resistance of individual strong force chains.en_US
dc.languageengen_US
dc.publisherWiley.en_US
dc.relation.ispartofInternational Journal for Numerical and Analytical Methods in Geomechanicsen_US
dc.titleInfluence of inter-particle friction on critical state behaviouren_US
dc.typeArticleen_US
dc.identifier.emailKwok, CY: fkwok8@hku.hken_US
dc.identifier.authorityKwok, CY=rp01344en_US
dc.identifier.doi10.1002/nag.2259en_US
dc.identifier.hkuros236130en_US
dc.identifier.volume38en_US
dc.identifier.issue12en_US
dc.identifier.spage1276en_US
dc.identifier.epage1297en_US
dc.identifier.isiWOS:000340601900004-

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