Location
San Diego, California
Presentation Date
26 May 2010, 2:45 pm - 3:30 pm
Abstract
An energy approach evaluating travel distance of debris in slope failures is proposed here, in which earthquake energy and gravitational potential energy are dissipated in flow deformations. Shake table model tests of dry sand slopes are carried out in which the earthquake energy dissipated in slope failure can be successfully quantified. The model tests indicate that measured slope displacements can be reliably evaluated by the proposed energy approach based on a rigid block model if an appropriate friction coefficient of the slope is specified. The energy approach is then applied to a number of slopes failed during recent earthquake in Japan to back-calculate mobilized friction coefficients, revealing their strong dependency on initial slope inclinations. It is clarified that the earthquake energy is actually much smaller than the potential energy for most of large slides, though it plays an important role of triggering slides. The friction coefficients are found smaller than the initial slope inclinations for gentler slopes, indicating that the failed soil masses tend to accelerate during sliding. The friction coefficients tend to decrease with increasing volume of failed slopes, which is compatible with previous case studies including large non-seismic landslides.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 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
Kokusho, Takaji and Ishizawa, Tomohiro, "Case Histories and Energy-Based Evaluation on Travel Distance of Slope Failures During Recent Earthquakes" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 2.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session10/2
Included in
Case Histories and Energy-Based Evaluation on Travel Distance of Slope Failures During Recent Earthquakes
San Diego, California
An energy approach evaluating travel distance of debris in slope failures is proposed here, in which earthquake energy and gravitational potential energy are dissipated in flow deformations. Shake table model tests of dry sand slopes are carried out in which the earthquake energy dissipated in slope failure can be successfully quantified. The model tests indicate that measured slope displacements can be reliably evaluated by the proposed energy approach based on a rigid block model if an appropriate friction coefficient of the slope is specified. The energy approach is then applied to a number of slopes failed during recent earthquake in Japan to back-calculate mobilized friction coefficients, revealing their strong dependency on initial slope inclinations. It is clarified that the earthquake energy is actually much smaller than the potential energy for most of large slides, though it plays an important role of triggering slides. The friction coefficients are found smaller than the initial slope inclinations for gentler slopes, indicating that the failed soil masses tend to accelerate during sliding. The friction coefficients tend to decrease with increasing volume of failed slopes, which is compatible with previous case studies including large non-seismic landslides.
