The undrained response of sands with additions of particles of various shapes and sizes

Georgiannou, VN

dc.contributor.author	Georgiannou, VN	en
dc.date.accessioned	2014-03-01T01:25:17Z
dc.date.available	2014-03-01T01:25:17Z
dc.date.issued	2006	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17632
dc.subject	Anisotropy	en
dc.subject	Fabric/structure of soils	en
dc.subject	Laboratory tests	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	Anisotropy	en
dc.subject.other	Clay	en
dc.subject.other	Compaction	en
dc.subject.other	Shear strength	en
dc.subject.other	Silt	en
dc.subject.other	Stiffness	en
dc.subject.other	Laboratory tests	en
dc.subject.other	Sand structure	en
dc.subject.other	Undrained response	en
dc.subject.other	Sand	en
dc.subject.other	anisotropy	en
dc.subject.other	consolidation	en
dc.subject.other	engineering	en
dc.subject.other	mica	en
dc.subject.other	sand	en
dc.subject.other	silt	en
dc.subject.other	stiffness	en
dc.subject.other	Xiphophorus maculatus	en
dc.title	The undrained response of sands with additions of particles of various shapes and sizes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.2006.56.9.639	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.2006.56.9.639	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	As a natural deposit, sand is rarely found clean - that is, without fractions of silt or clay. The engineering behaviour of two different host sand gradations mixed with additions of particles of various shapes and sizes is compared with that of clean sand. Anisotropically consolidated specimens are sheared in triaxial compression and extension at their 'loosest' initial state resulting from the same depositional method, namely air pluviation. Additive materials at contents less than 2-5% by weight can dramatically change the undrained behaviour of the host sand. The addition of rotund particles (e.g. silt) should be distinguished from that of flat or platy particles of different size (e.g. kaolin, silt or sand-size mica The importance of shape and location of additives in modifying the sand structure is not reflected in measures such as void ratio. Mixtures of both sands with silt-size mica exhibit the most unstable response, although these had the lowest values of void or granular void ratio. The undrained response of each sand mixed with different amounts of sand-size mica is also presented. An increase in mica content usually leads to more stable behaviour at contents above a certain threshold, depending on the grading of the sand. The shear response of the sands and most mixtures is much weaker and more contractive in triaxial extension than in triaxial compression. High anisotropy is also indicated by the stiffness measurements at small strains in both loading directions.	en
heal.publisher	THOMAS TELFORD PUBLISHING	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.2006.56.9.639	en
dc.identifier.isi	ISI:000242908900006	en
dc.identifier.volume	56	en
dc.identifier.issue	9	en
dc.identifier.spage	639	en
dc.identifier.epage	649	en