A constitutive model for structured soils

Kavvadas, M; Amorosi, A

dc.contributor.author	Kavvadas, M	en
dc.contributor.author	Amorosi, A	en
dc.date.accessioned	2014-03-01T01:49:41Z
dc.date.available	2014-03-01T01:49:41Z
dc.date.issued	2000	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25890
dc.subject	constitutive relations	en
dc.subject	plasticity	en
dc.subject	fabric/structure of soils	en
dc.subject	numerical modelling and analysis	en
dc.subject	anisotropy	en
dc.subject	clays	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	ANISOTROPIC HARDENING MODEL	en
dc.subject.other	TRIAXIAL COMPRESSION	en
dc.subject.other	CLAYS	en
dc.subject.other	PLASTICITY	en
dc.subject.other	STRENGTH	en
dc.subject.other	BEHAVIOR	en
dc.subject.other	SANDS	en
dc.title	A constitutive model for structured soils	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The paper proposes a constitutive model for structured soils (MSS) which describes the engineering effects of structure development and degradation, such as: high intact stiffness and strength, appreciable reduction of stiffness and strength due to de-structuring, and evolution of stress- and structure-induced anisotropy. A key feature of the model is the treatment of pre-consolidation as a structure-inducing process and the unified description of all such processes via a 'bond strength envelope' associated with the onset of appreciable de-structuring and distinguished from the onset of plastic yielding. Other features include: a damage-type mechanism to model volumetric and deviatoric structure degradation, the evolution of stress- and bond-induced anisotropy using a fading memory scheme, adaptable predictive capabilities depending on the sophistication of the available test data, modularity to extend its applicability in several soil types, and mathematical formulation in a general tensorial space to facilitate its incorporation in finite element codes. The predictive capabilities of the model are evaluated against the results of laboratory tests on the stiff overconsolidated Vallericca clay: (a) isotropic and anisotropic consolidation tests up to very high pressures; and (b) anisotropically consolidated triaxial shearing at both low pressures (structured material response) and high pressures (de-structured material response).	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	GEOTECHNIQUE	en
dc.identifier.isi	ISI:000087907600005	en
dc.identifier.volume	50	en
dc.identifier.issue	3	en
dc.identifier.spage	263	en
dc.identifier.epage	273	en