Abstract
Rock avalanches are known to behave in extraordinary ways unlike other landslides, and their deposits in part reflect their unusual physical behavior. Recent experiments in granular physics suggest that many phenomena and features simply reflect the non-linear nature of granular flows, although some behavior cannot simply be reproduced in lab scale experiments. In a static configuration, grain–grain contact networks dominate the distribution of forces and stresses within a granular mass. During flow, granular collisions damp the system through energy dissipation, while gravitational potential drives the system. The energy distribution between static and collisional stresses within the system can change very rapidly. Threshold events dominate system response, and the challenge is to find which characterization of the static phase helps to predict failure (and thus flow) resistance. Once flowing, many “unusual” rock-avalanche phenomena are entirely consistent with the physics of flow of large granular masses, but the low energy dissipation rate required for long run-out events requires the presence of physical processes that are not involved in experimental flows in the current parameter range or in the assumptions of current models.
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Acknowledgements
This research was carried out as part of NASA research grant NAG32736. Thanks to M. Toiya, D. Britti, M. Newey, J. Harp, E. Schemm, and R. Pizzarro who carried out some of the granular experiments. Special thanks to Don Martin for his help in designing and assembling the experiments. Thanks to P. Richard and R. Delanney for input and expenses.
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Friedmann, S.J., Taberlet, N. & Losert, W. Rock-avalanche dynamics: insights from granular physics experiments. Int J Earth Sci (Geol Rundsch) 95, 911–919 (2006). https://doi.org/10.1007/s00531-006-0067-9
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DOI: https://doi.org/10.1007/s00531-006-0067-9