Numerical modeling of seismic triggering, evolution, and deposition of rapid landslides: Application to Higashi-Takezawa (2004)

Gerolymos, N

dc.contributor.author	Gerolymos, N	en
dc.date.accessioned	2014-03-01T01:33:57Z
dc.date.available	2014-03-01T01:33:57Z
dc.date.issued	2010	en
dc.identifier.issn	0363-9061	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20633
dc.subject	Deposition mechanism	en
dc.subject	Depth-integrated model	en
dc.subject	Failure	en
dc.subject	Grain crushing	en
dc.subject	Rapid landslide	en
dc.subject	Seismic triggering	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Mechanics	en
dc.subject.other	Deposition mechanism	en
dc.subject.other	Failure	en
dc.subject.other	Grain crushing	en
dc.subject.other	Integrated models	en
dc.subject.other	Seismic triggering	en
dc.subject.other	Biology	en
dc.subject.other	Crushing	en
dc.subject.other	Deformation	en
dc.subject.other	Dynamic analysis	en
dc.subject.other	Earthquakes	en
dc.subject.other	Equations of motion	en
dc.subject.other	Equations of state	en
dc.subject.other	Friction	en
dc.subject.other	Mathematical models	en
dc.subject.other	Numerical analysis	en
dc.subject.other	Shear bands	en
dc.subject.other	Landslides	en
dc.subject.other	deformation	en
dc.subject.other	deposition	en
dc.subject.other	displacement	en
dc.subject.other	dynamic analysis	en
dc.subject.other	earthquake event	en
dc.subject.other	failure analysis	en
dc.subject.other	landslide	en
dc.subject.other	loading	en
dc.subject.other	numerical model	en
dc.subject.other	rheology	en
dc.subject.other	seismicity	en
dc.subject.other	shear	en
dc.subject.other	slope	en
dc.subject.other	trigger mechanism	en
dc.title	Numerical modeling of seismic triggering, evolution, and deposition of rapid landslides: Application to Higashi-Takezawa (2004)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/nag.812	en
heal.identifier.secondary	http://dx.doi.org/10.1002/nag.812	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	A mathematical model is developed for the dynamic analysis of earthquake-triggered rapid landslides, considering two mechanically coupled systems: (a) the accelerating deformable body of the slide and (b) the rapidly deforming shear band at the base of the slide. The main body of the slide is considered as a one-phase mixture of Newtonian incompressible fluids and Coulomb solids sliding on a plane of variable inclination. The evolution of the landslide is modeled via a depth-integrated model of the Savage-Hutter type coupled with: (a) a cyclic hysteretic constitutive model of the Bouc-Wen type and (b) Voellmy's rheology for the deformation of the material within the shear band. The original shallow-water equations that govern the landslide motion are appropriately reformulated to account for inertial forces due to seismic loading, and to allow for a smooth transition between the active and the passive state. The capability of the developed model is tested against the Higashi-Takezawa landslide. Triggered by the 2004 Niigata-ken Chuetsu earthquake, the slide produced about 100m displacement of a large wedge from an originally rather mild slope. The mechanism of material softening inside the shear band responsible for the surprisingly large run-out of the landslide is described by a set of equations for grain crushing-induced pore-water pressures. The back-analysis reveals interesting patterns on the flow dynamics, and the numerical results compare well with field observations. It is shown that the mechanism of material softening is a crucial factor for the initiation and evolution of the landslide, while viscoplastic frictional resistance is a key requirement for successfully reproducing the field data. © 2009 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	International Journal for Numerical and Analytical Methods in Geomechanics	en
dc.identifier.doi	10.1002/nag.812	en
dc.identifier.isi	ISI:000274934900003	en
dc.identifier.volume	34	en
dc.identifier.issue	4	en
dc.identifier.spage	383	en
dc.identifier.epage	407	en