A constitutive, framework for anisotropic sand including non-proportional loading

Li, XS; Dafalias, YF

dc.contributor.author	Li, XS	en
dc.contributor.author	Dafalias, YF	en
dc.date.accessioned	2014-03-01T01:19:44Z
dc.date.available	2014-03-01T01:19:44Z
dc.date.issued	2004	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15682
dc.subject	Anisotropy	en
dc.subject	Constitutive relations	en
dc.subject	Deformation	en
dc.subject	Fabric/structure of soils	en
dc.subject	Plasticity	en
dc.subject	Sands	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Anisotropy	en
dc.subject.other	Deformation	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Mathematical models	en
dc.subject.other	Plastics	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Stress analysis	en
dc.subject.other	Tensors	en
dc.subject.other	Loading directions	en
dc.subject.other	Platform models	en
dc.subject.other	Geology	en
dc.subject.other	anisotropy	en
dc.subject.other	loading	en
dc.subject.other	numerical model	en
dc.subject.other	plastic deformation	en
dc.subject.other	plasticity	en
dc.subject.other	sand	en
dc.subject.other	soil mechanics	en
dc.title	A constitutive, framework for anisotropic sand including non-proportional loading	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.54.1.41.36329	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.54.1.41.36329	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	An existing platform model for inherently anisotropic sands is extended to account for deformations induced by non-proportional loadings. The platform model is within the framework of critical-state soil mechanics, and the inherent anisotropy is accounted for by rendering the critical-state line in the e-p plane and the deviatoric plastic modulus functions of a scalar-valued anisotropic parameter, Ā. The latter is defined in terms of joint isotropic invariants of a symmetric fabric tensor and a properly defined loading direction tensor. Proportional and some non-proportional loading responses, including stress reversals, can be successfully simulated by the platform model, but the response under loading involving significant principal stress rotations requires the introduction of an additional loading mechanism. This new mechanism is associated with components of the stress ratio rate and plastic strain rate, which are orthogonal to a loading direction coaxial with the stress ratio. The novelty in this respect is associated with the dependence of the dilatancy and plastic modulus of this new mechanism on a second anisotropic parameter, A, to account for the fabric anisotropy effect along the lines of the platform model. The resulting comprehensive model successfully simulates experimental data reflecting the complex combined effects of fabric anisotropy and non-proportional loading histories.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.54.1.41.36329	en
dc.identifier.isi	ISI:000220058200004	en
dc.identifier.volume	54	en
dc.identifier.issue	1	en
dc.identifier.spage	41	en
dc.identifier.epage	55	en