NDLI: Catastrophic landslides associated with the M8.0 Wenchuan earthquake

Content Provider	Springer Nature Link
Author	Yin, Yueping Zheng, Wanmo Li, Xiaochun Sun, Ping Li, Bin
Copyright Year	2010
Abstract	Numerous earthquake-induced landslides occurred in the Longmenshan tectonic belt associated with the 12th May 2008 Wenchuan earthquake where the vertical acceleration was greater than the horizontal ground motion. Many of these landslides originated in the steep mountain terrain which amplified the effect of the ground shaking. Three typical landslides are discussed: the Niujuangou sturzstrom, the Chengxi rock slide and the 1,100 million m3 Daguangbao rock slide. Having discussed the individual slides and some previously published models, a mechanism to explain both the very fast velocity of the slides and their long run-out distance is proposed, taking into account aerodynamic principles. The model postulates that air trapped in the steep-sided valley by the collapsing rock mass forms a “cushion-effect” on which the debris moves.De nombreux glissements ont été déclenchés par le séisme de Wenchuan le 12 mai 2008 dans les montagnes de Longmenshan où l’accélération verticale a été plus grande que l’accélération horizontale. Beaucoup de ces glissements se sont produits sur des pentes raides qui ont amplifié les effets du mouvement sismique. Trois glissements typiques sont présentés: le mouvement gravitaire rapide de Niujuangou, le glissement rocheux de Chengxi et le glissement rocheux de Daguangbao de 1100 millions de m3. Après l’analyse de chacun de ces glissements et de plusieurs modèles précédemment présentés à leur sujet, un mécanisme permettant d’expliquer à la fois la très rapide vitesse de déplacement des glissements et leur longue distance de déplacement est proposé, prenant en compte des principes d’aérodynamique. Le modèle suppose que l’air, emprisonné dans la vallée aux pentes raides par les masses rocheuses en glissement, a formé un coussin d’air sur lequel les roches broyées se sont déplacées.
Starting Page	15
Ending Page	32
Page Count	18
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	70
Issue Number	1
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Glissements catastrophiques Séisme de Wenchuan Mouvement gravitaire rapide Accélération Lac de barrage Coussin d’air Geoecology/Natural Processes Nature Conservation Geoengineering, Foundations, Hydraulics Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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