Fluidisation in artesian flow conditions: Hydrochemically stable 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/123456789/15950
dc.subject	Liquefaction	en
dc.subject	Permeability	en
dc.subject	Sands	en
dc.subject	Seepage	en
dc.subject	Water flow	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Fluidization	en
dc.subject.other	Granular materials	en
dc.subject.other	Porosity	en
dc.subject.other	Viscosity	en
dc.subject.other	Phase change	en
dc.subject.other	Two-phase continuum theory	en
dc.subject.other	Geotechnical engineering	en
dc.subject.other	fluidization	en
dc.subject.other	granular medium	en
dc.subject.other	mechanical property	en
dc.subject.other	fluidization	en
dc.subject.other	granular medium	en
dc.subject.other	hydromechanics	en
dc.subject.other	liquefaction	en
dc.title	Fluidisation in artesian flow conditions: Hydrochemically stable granular media	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.54.2.117.36342	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.54.2.117.36342	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	In this paper a two-phase continuum theory for fully fluidised, fluid-flowing, granular media is presented. The analysis is restricted to the fluidisation process involving internally stable granular media in artesian conditions. Based on fluidised column test results it is demonstrated that, at the state of incipient fluidisation, the material undergoes a discontinuous transition that can be seen as a phase change. The stationary fluidised state is characterised by the development of particle repulsion and the effect of weak inertia on the resistance of the granular bed to flow. Based on Richardson's expansion law it is demonstrated that the adjustment of porosity to small increases in the fluid flow rate may be approximately described by small-amplitude kinematic porosity rarefaction waves. Linear stability analysis of perturbations out of the stationary state of uniform fluidisation shows that granular inertia plays a destabilising role that leads to mathematical ill-posedeness, which in turn is removed by considering the effect of the mixture's viscosity.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.54.2.117.36342	en
dc.identifier.isi	ISI:000220974100004	en
dc.identifier.volume	54	en
dc.identifier.issue	2	en
dc.identifier.spage	117	en
dc.identifier.epage	130	en