Location
Arlington, Virginia
Date
15 Aug 2008, 8:00 am - 8:30 am
Abstract
Two earthquake–triggered violent landslides are studied. The Nikawa, activated by the Mw 7 1995 Kobe Earthquake, and the Higashi–Takezawa, activated by the MJMA 6.8 2004 Niigata-ken Chuetsu earthquake, in Japan. Both landslides involved about 100 m displace-ment of a large wedge of an originally rather mild slope. The surprisingly large and rapid in nature runoff of the soil masses, motivated several researchers to interpret the sliding process. There is still no consensus as to which were the actual causes of those two catastrophic events. The goal of the paper is to study: (i) the landslide triggering and propagation, and (ii) the mechanism of material softening inside the shear band responsible for the accelerating movement of the two slides. To this, a model is utilised considering two mechanically coupled substructures: (a) the accelerating deformable body of the slide, and (b) the rapidly deforming shear band at the base of the slide. It combines features of an extended Savage–Hutter approach, with (a) Mohr–Coulomb failure criteria, and (b) Bouc–Wen hysteretic stress–strain relationship, and exploits the concept of grain crushing–induced instability. The method success-fully interprets the studied landslides.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Gerolymos, N., "Analysis of Two Case Histories of Violent Landslides Triggered by Earthquakes" (2008). International Conference on Case Histories in Geotechnical Engineering. 7.
https://scholarsmine.mst.edu/icchge/6icchge/session13/7
Analysis of Two Case Histories of Violent Landslides Triggered by Earthquakes
Arlington, Virginia
Two earthquake–triggered violent landslides are studied. The Nikawa, activated by the Mw 7 1995 Kobe Earthquake, and the Higashi–Takezawa, activated by the MJMA 6.8 2004 Niigata-ken Chuetsu earthquake, in Japan. Both landslides involved about 100 m displace-ment of a large wedge of an originally rather mild slope. The surprisingly large and rapid in nature runoff of the soil masses, motivated several researchers to interpret the sliding process. There is still no consensus as to which were the actual causes of those two catastrophic events. The goal of the paper is to study: (i) the landslide triggering and propagation, and (ii) the mechanism of material softening inside the shear band responsible for the accelerating movement of the two slides. To this, a model is utilised considering two mechanically coupled substructures: (a) the accelerating deformable body of the slide, and (b) the rapidly deforming shear band at the base of the slide. It combines features of an extended Savage–Hutter approach, with (a) Mohr–Coulomb failure criteria, and (b) Bouc–Wen hysteretic stress–strain relationship, and exploits the concept of grain crushing–induced instability. The method success-fully interprets the studied landslides.
