Dynamic thermo-poro-mechanical analysis of catastrophic landslides

Vardoulakis, I

dc.contributor.author	Vardoulakis, I	en
dc.date.accessioned	2014-03-01T01:17:45Z
dc.date.available	2014-03-01T01:17:45Z
dc.date.issued	2002	en
dc.identifier.issn	0016-8505	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14646
dc.subject	Clays	en
dc.subject	Dynamics	en
dc.subject	Failure	en
dc.subject	Landslides	en
dc.subject	Temperature effects	en
dc.subject	Time dependence	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Pore pressure	en
dc.subject.other	Shear deformation	en
dc.subject.other	Thermoplastics	en
dc.subject.other	Thermo-pro-mechanical analysis	en
dc.subject.other	Landslides	en
dc.subject.other	dynamic analysis	en
dc.subject.other	landslide	en
dc.subject.other	pore pressure	en
dc.subject.other	shear band	en
dc.subject.other	thermomechanics	en
dc.title	Dynamic thermo-poro-mechanical analysis of catastrophic landslides	en
heal.type	journalArticle	en
heal.identifier.primary	10.1680/geot.52.3.157.41012	en
heal.identifier.secondary	http://dx.doi.org/10.1680/geot.52.3.157.41012	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	In this paper a dynamic analysis is presented of the early stages of an earth slide, considering two mechanically coupled substructures: (a) the rapidly deforming shear band at the base of the slide, and (b) the accelerating (rotating) rigid body. This is done by exploiting the concepts of frictional rate softening and thermo-poro-mechanical softening of the soil, and by modifying the friction-circle method of Taylor (1948). First the equations are summarised that govern the phenomenon of heat-generated pore pressures inside a rapidly deforming shear band, and then the estimates for the various material parameters that enter the governing equations are critically discussed. In particular an attempt is made to adjust these material parameters to existing experimental data and to the properties of the clay soil responsible for the Vaiont slide of October 1963. The numerical analysis of the governing equations for the two mechanically coupled substructures leads to the following conclusions. The accelerated motion is caused by material strain-softening, which in turn feeds further material strain-rate softening inside the shear band. Owing to the speed of the initiated process, heat is trapped inside the shear band, which leads rapidly to a pore-pressure explosion in it owing to thermoplastic collapse of the clayey gouge, leading rapidly to total loss of strength and to uninhibited sliding motion on a frictionless base.	en
heal.publisher	THOMAS TELFORD SERVICES LTD	en
heal.journalName	Geotechnique	en
dc.identifier.doi	10.1680/geot.52.3.157.41012	en
dc.identifier.isi	ISI:000174973500001	en
dc.identifier.volume	52	en
dc.identifier.issue	3	en
dc.identifier.spage	157	en
dc.identifier.epage	171	en