Effect of grain shape and angularity on the undrained response of fine sands

Tsomokos, A; Georgiannou, VN

dc.contributor.author	Tsomokos, A	en
dc.contributor.author	Georgiannou, VN	en
dc.date.accessioned	2014-03-01T01:33:18Z
dc.date.available	2014-03-01T01:33:18Z
dc.date.issued	2010	en
dc.identifier.issn	0008-3674	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20366
dc.subject	Angularity	en
dc.subject	Laboratory tests	en
dc.subject	Sands	en
dc.subject	Stiffness	en
dc.subject	Torsional shear	en
dc.subject	Triaxial compression	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Angularity	en
dc.subject.other	Laboratory test	en
dc.subject.other	Laboratory tests	en
dc.subject.other	Torsional shear	en
dc.subject.other	Triaxial compression	en
dc.subject.other	Compression testing	en
dc.subject.other	Stiffness	en
dc.subject.other	Sand	en
dc.subject.other	compression	en
dc.subject.other	cylinder	en
dc.subject.other	fine grained sediment	en
dc.subject.other	grain size	en
dc.subject.other	laboratory method	en
dc.subject.other	sand	en
dc.subject.other	scanning electron microscopy	en
dc.subject.other	shear stress	en
dc.subject.other	stiffness	en
dc.subject.other	torsion	en
dc.subject.other	triaxial test	en
dc.subject.other	void ratio	en
dc.title	Effect of grain shape and angularity on the undrained response of fine sands	en
heal.type	journalArticle	en
heal.identifier.primary	10.1139/T09-121	en
heal.identifier.secondary	http://dx.doi.org/10.1139/T09-121	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The objective of this paper is to discuss the effect of grain shape and angularity on the undrained behaviour of sands. Four fine to medium (D50 = 0.15-0.29 mm) and uniform sands were examined. These sands have similar and (or) identical grading curves, but differ with respect to the angularity of their grains. Under the electron scanning microscope two sands have rounded grains and the other two have subangular to angular grains. For sands with rounded grains, evidence of undrained behaviour undergoing systematic weakening (shear stress reduction after a transient peak deviator stress) is provided by torsional hollow cylinder tests. However, sands with the same grading curve and void ratio, but angular grains, show stable response with a continuous increase in strength after a transient peak. A small variation in the sand gradation, i.e., D50 = 0.22 ± 0.07 mm, does not appear to alter the pattern of undrained response described earlier, with the angular sand (D50 = 0.15) exhibiting stable response to shear and the rounded sands (D50 = 0.22 and 0.29) having unstable response to shear. The stiffness characteristics of the sands are also presented. Triaxial compression tests were performed to confirm the pattern of response observed under torsional testing.	en
heal.publisher	NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS	en
heal.journalName	Canadian Geotechnical Journal	en
dc.identifier.doi	10.1139/T09-121	en
dc.identifier.isi	ISI:000277476300004	en
dc.identifier.volume	47	en
dc.identifier.issue	5	en
dc.identifier.spage	539	en
dc.identifier.epage	551	en