Monotonie and cyclic behaviour of sand under torsional loading

Georgiannou, VN; Tsomokos, A; Stavrou, K

dc.contributor.author	Georgiannou, VN	en
dc.contributor.author	Tsomokos, A	en
dc.contributor.author	Stavrou, K	en
dc.date.accessioned	2014-03-01T01:28:47Z
dc.date.available	2014-03-01T01:28:47Z
dc.date.issued	2008	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18975
dc.subject	Laboratory tests	en
dc.subject	Liquefaction	en
dc.subject	Sands	en
dc.subject	Shear strength	en
dc.subject	Stiffness	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Cyclic loads	en
dc.subject.other	Cylinders (shapes)	en
dc.subject.other	Liquefaction	en
dc.subject.other	Shear strength	en
dc.subject.other	Stiffness	en
dc.subject.other	Strain measurement	en
dc.subject.other	Stress analysis	en
dc.subject.other	Torsional loading	en
dc.subject.other	Water pressure generation	en
dc.subject.other	Sand	en
dc.subject.other	laboratory method	en
dc.subject.other	liquefaction	en
dc.subject.other	sand	en
dc.subject.other	shear strength	en
dc.subject.other	stiffness	en
dc.subject.other	stress-strain relationship	en
dc.subject.other	torsion	en
dc.title	Monotonie and cyclic behaviour of sand under torsional loading	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.2008.58.2.113	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.2008.58.2.113	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Comprehensive tests were performed to obtain the stress - strain and stiffness characteristics of a fine uniform sand in a hollow cylinder apparatus under monotonic and cyclic torsional loading. Unstable response with a sudden reduction in shear strength after peak was observed under undrained monotonic loading. After a quasi-steady state the specimens showed a phase transformation and a tendency to dilation. Drained torsional hollow cylinder tests showed an equivalent characteristic state marking the transition between contractant and dilatant behaviour and the same line at phase transformation as their undrained counterparts. The instability line, defined under monotonic loading, appears to form a boundary to the behaviour of sand under cyclic loading. Unstable behaviour is introduced when the effective stress path followed by the specimen during cyclic loading reaches the instability line at a shear strain of approximately 0.5%. The first loading cycle is at variance with the following cycles in terms of the stress - dilatancy relationship in drained or the excess pore water pressure generation in undrained torsional hollow cylinder tests. The liquefaction, stiffness and damping characteristics of the sand have been defined.	en
heal.publisher	THOMAS TELFORD PUBLISHING	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.2008.58.2.113	en
dc.identifier.isi	ISI:000253013300003	en
dc.identifier.volume	58	en
dc.identifier.issue	2	en
dc.identifier.spage	113	en
dc.identifier.epage	124	en