State pressure index for modeling sand behavior

Wang, Z-L; Dafalias, YF; Li, X-S; Makdisi, FI

dc.contributor.author	Wang, Z-L	en
dc.contributor.author	Dafalias, YF	en
dc.contributor.author	Li, X-S	en
dc.contributor.author	Makdisi, FI	en
dc.date.accessioned	2014-03-01T01:18:22Z
dc.date.available	2014-03-01T01:18:22Z
dc.date.issued	2002	en
dc.identifier.issn	1090-0241	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14955
dc.subject	Bounding surface	en
dc.subject	Dilatancy	en
dc.subject	Plasticity	en
dc.subject	Pressure	en
dc.subject	Sand	en
dc.subject	Strain softening	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Computer simulation	en
dc.subject.other	Geotechnical engineering	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Strain hardening	en
dc.subject.other	Dilatancy	en
dc.subject.other	Sand	en
dc.subject.other	critical state	en
dc.subject.other	plasticity	en
dc.subject.other	pressure	en
dc.subject.other	sand	en
dc.subject.other	softening	en
dc.subject.other	soil mechanics	en
dc.subject.other	strain	en
dc.subject.other	void ratio	en
dc.title	State pressure index for modeling sand behavior	en
heal.type	journalArticle	en
heal.identifier.primary	10.1061/(ASCE)1090-0241(2002)128:6(511)	en
heal.identifier.secondary	http://dx.doi.org/10.1061/(ASCE)1090-0241(2002)128:6(511)	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The effort to model sand behavior within the framework of critical-state soil mechanics would benefit from a state variable that relates the current void ratio and mean pressure of the soil to its void ratio and mean pressure at the critical state. In this paper we propose a state pressure index, I-p, which is defined as the ratio of the current mean pressure to the mean pressure at the critical state that corresponds to the current void ratio. Using this state pressure index, a bounding surface hypoplasticity model for sand is modified so that the phase transformation and failure stress ratios both depend on I-p and merge into the critical-state stress ratio at failure. The I-p dependency introduced enables use of a single set of model constants in modeling sand behavior for various initial confining pressures and densities under both undrained and drained conditions. Dilatancy, strain softening, and strain hardening are simulated for both loose and dense sands. Simulations from the modified model are compared with results of laboratory tests of drained and undrained triaxial compression.	en
heal.publisher	ASCE-AMER SOC CIVIL ENGINEERS	en
heal.journalName	Journal of Geotechnical and Geoenvironmental Engineering	en
dc.identifier.doi	10.1061/(ASCE)1090-0241(2002)128:6(511)	en
dc.identifier.isi	ISI:000175722400007	en
dc.identifier.volume	128	en
dc.identifier.issue	6	en
dc.identifier.spage	511	en
dc.identifier.epage	519	en