Fluidisation in artesian flow conditions: Hydromechanically unstable granular media

Vardoulakis, I

dc.contributor.author	Vardoulakis, I	en
dc.date.accessioned	2014-03-01T01:20:32Z
dc.date.available	2014-03-01T01:20:32Z
dc.date.issued	2004	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15951
dc.subject	Erosion	en
dc.subject	Filters	en
dc.subject	Permeability	en
dc.subject	Sands	en
dc.subject	Seepage	en
dc.subject	Waterflow	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Erosion	en
dc.subject.other	Fluidization	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Granular materials	en
dc.subject.other	Soils	en
dc.subject.other	Artesian flow	en
dc.subject.other	Column tests	en
dc.subject.other	Momentum balance	en
dc.subject.other	Flow of fluids	en
dc.subject.other	fluidization	en
dc.subject.other	hydromechanics	en
dc.subject.other	piping	en
dc.subject.other	soil erosion	en
dc.subject.other	soil mechanics	en
dc.title	Fluidisation in artesian flow conditions: Hydromechanically unstable granular media	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.54.3.165.36345	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.54.3.165.36345	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The present analysis focuses on fluidisation and erosion processes involving hydromechanically unstable granular materials in artesian flow conditions, as these phenomena were documented in column tests with gap-graded soils by Skempton & Brogan. It is shown that the observed abnormal decrease in hydraulic resistivity can be attributed to fluidisation of the fines fraction of the soil, which eventually leads to unplugging of the pore space and segregation piping erosion in the form of a runaway instability. For the description of the erosion process a continuum theory for three-phase media consisting of stationary grains, transported grains and pore fluid is presented. The governing mass balance and momentum balance equations, and the constitutive law for particle erosion are formulated and discussed in the light of the experimental evidence.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.54.3.165.36345	en
dc.identifier.isi	ISI:000221725400002	en
dc.identifier.volume	54	en
dc.identifier.issue	3	en
dc.identifier.spage	165	en
dc.identifier.epage	177	en