Anisotropic Critical State Theory: Role of Fabric

Li, XS; Dafalias, YF

dc.contributor.author	Li, XS	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T02:07:44Z
dc.date.available	2014-03-01T02:07:44Z
dc.date.issued	2012	en
dc.identifier.issn	07339399	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29607
dc.subject	Anisotropy	en
dc.subject	Critical state	en
dc.subject	Fabric	en
dc.subject	Soil mechanics	en
dc.subject	State parameter	en
dc.subject.other	Anisotropic material	en
dc.subject.other	Critical state	en
dc.subject.other	Critical state lines	en
dc.subject.other	Critical value	en
dc.subject.other	Experimental studies	en
dc.subject.other	Fabric tensors	en
dc.subject.other	Granular media	en
dc.subject.other	Loading direction	en
dc.subject.other	Micro-mechanical	en
dc.subject.other	State parameters	en
dc.subject.other	Static liquefaction	en
dc.subject.other	Stress ratio	en
dc.subject.other	Void ratios	en
dc.subject.other	Anisotropy	en
dc.subject.other	Computer simulation	en
dc.subject.other	Fabrics	en
dc.subject.other	Slip forming	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Tensors	en
dc.subject.other	Critical current density (superconductivity)	en
dc.subject.other	anisotropy	en
dc.subject.other	critical state	en
dc.subject.other	experimental study	en
dc.subject.other	liquefaction	en
dc.subject.other	parameterization	en
dc.subject.other	soil mechanics	en
dc.subject.other	soil property	en
dc.subject.other	thermodynamics	en
dc.subject.other	triaxial test	en
dc.title	Anisotropic Critical State Theory: Role of Fabric	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)EM.1943-7889.0000324	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)EM.1943-7889.0000324	en
heal.publicationDate	2012	en
heal.abstract	An Anisotropic Critical State Theory (ACST) for granular media is presented, which accounts for the role of anisotropic fabric at critical state. It enhances the requirements of critical values for the stress and void ratio of the classical Critical State Theory (CST) by an additional requirement of critical value for an appropriate measure of fabric-anisotropy. A fabric tensor and its evolution toward a critical value, norm-wise and direction-wise, is introduced motivated by micromechanical and experimental studies. On the basis of a scalar-valued fabric-anisotropy variable relating the evolving fabric tensor to the loading direction, a dilatancy state line is defined in the void ratio-pressure plane which determines a dilatancy state parameter ζ that characterizes the contracting or dilating trends of the current state. When the fabric-anisotropy variable reaches its critical state value, the dilatancy state line becomes identical to the critical state line and the ζ identical to the well-known state parameter ψ An immediate corollary is the uniqueness of the critical state line, for which a thermodynamic proof is provided on the basis of the Gibbs condition. Static liquefaction is obtained when ζ = o with the stress ratio reaching its critical value but not the void ratio and the fabric. Simulations of anisotropic material response by a triaxial model are used to illustrate the effectiveness of the novel ACST. © 2012 American Society of Civil Engineers.	en
heal.journalName	Journal of Engineering Mechanics	en
dc.identifier.doi	10.1061/(ASCE)EM.1943-7889.0000324	en
dc.identifier.volume	138	en
dc.identifier.issue	3	en
dc.identifier.spage	263	en
dc.identifier.epage	275	en