Comparison of two fine sands under torsional loading

Georgiannou, VN; Tsomokos, A

dc.contributor.author	Georgiannou, VN	en
dc.contributor.author	Tsomokos, A	en
dc.date.accessioned	2014-03-01T01:28:03Z
dc.date.available	2014-03-01T01:28:03Z
dc.date.issued	2008	en
dc.identifier.issn	0008-3674	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18688
dc.subject	Laboratory tests	en
dc.subject	Liquefaction	en
dc.subject	Sands	en
dc.subject	Stiffness	en
dc.subject	Torsional shear	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Cyclic loadings	en
dc.subject.other	Damping characteristics	en
dc.subject.other	Fine sand	en
dc.subject.other	Hollow cylinder apparatus	en
dc.subject.other	Hollow cylinders	en
dc.subject.other	Laboratory tests	en
dc.subject.other	Monotonic and cyclic loading	en
dc.subject.other	Monotonic loading	en
dc.subject.other	Phase transformation	en
dc.subject.other	Phase transformation line	en
dc.subject.other	Pore-water pressures	en
dc.subject.other	Strength reduction	en
dc.subject.other	Stress ratio	en
dc.subject.other	Torsional loadings	en
dc.subject.other	Torsional shear	en
dc.subject.other	Undrained	en
dc.subject.other	Void ratios	en
dc.subject.other	Cyclic loads	en
dc.subject.other	Cylinders (shapes)	en
dc.subject.other	Damping	en
dc.subject.other	Liquefaction	en
dc.subject.other	Shear strain	en
dc.subject.other	Shear strength	en
dc.subject.other	Steel structures	en
dc.subject.other	Stiffness	en
dc.subject.other	Testing	en
dc.subject.other	Sand	en
dc.subject.other	comparative study	en
dc.subject.other	fine grained sediment	en
dc.subject.other	laboratory method	en
dc.subject.other	liquefaction	en
dc.subject.other	loading test	en
dc.subject.other	porewater	en
dc.subject.other	sand	en
dc.subject.other	stiffness	en
dc.subject.other	strength	en
dc.subject.other	stress	en
dc.subject.other	torsion	en
dc.title	Comparison of two fine sands under torsional loading	en
heal.type	journalArticle	en
heal.identifier.primary	10.1139/T08-083	en
heal.identifier.secondary	http://dx.doi.org/10.1139/T08-083	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	In this paper the behaviour of two ''standard research sands'', widely used for experimental purposes, is compared in a torsional hollow cylinder apparatus under monotonic and cyclic loading conditions. Both sands are fine and uniform with D50 = 0.22 and 0.29 mm, respectively. However, their response to undrained monotonic loading at similar void ratios is dramatically different, with the finer sand showing strength reduction after peak and the coarser sand showing continuous increase in strength with torsional shear. The difference in response is mainly attributed to grain angularity and to a lesser degree to their grading. The results of drained torsional hollow cylinder tests show initial contraction followed by dilation. The stress ratio at phase transformation is uniquely defined by both drained and undrained tests for each sand. Cyclic loading instability is manifested by a sudden increase in shear strain and excess pore-water pressure leading to initial liquefaction. The instability initiates across the instability line for the sand showing strength reduction and across the phase transformation line for the sand showing continuous increase in strength with shearing. Both lines are defined under monotonic loading conditions. The liquefaction, stiffness, and damping characteristics of the sands are given in this paper. © 2008 NRC Canada.	en
heal.publisher	NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS	en
heal.journalName	Canadian Geotechnical Journal	en
dc.identifier.doi	10.1139/T08-083	en
dc.identifier.isi	ISI:000261909600002	en
dc.identifier.volume	45	en
dc.identifier.issue	12	en
dc.identifier.spage	1659	en
dc.identifier.epage	1672	en