Abstract
A landslide model riding on basal guided waves is investigated to explain lower net frictions at high slide velocities from the wave-theoretical point of view. It is shown that there is a wave propagated along the basal layer at the phase velocity equal to the slide velocity, as well as a guided wave with considerably higher phase velocities propagated likewise along the basal layer as a leaking mode at low slide velocities. With increasing slide velocity the phase velocity of the guided wave decreases until it is equal to that of the slide mass. Over this threshold slide velocity, a “sonic boom” is generated around the basal layer, and the shock contributes to a loosening of the slide mass into a fluidized state. Landslides on long slide-ways are more liable to exceed this threshold velocity since their slide velocities tend to be higher than those on short slide-ways of a similar shape. Hence, the reduction of net friction of landslides can possibly be better correlated with the lengths of slide-ways than with the volumes of landslides as is widely maintained.
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References
Ashida, K., andEgashira, S. (1986),Running-out Processes of the Debris Associated with the Ontake Landslide, Natural Disaster Science8, 63–79.
Bagnold, R. A. (1954),Experiments on a Gravity-free Dispersion of Large Solid Spheres in a Newtonian Fluid under Shear, Proc. Roy. Soc. London225A, 49–63.
Cluff, L. S. (1971),Peru Earthquake of May 31, 1970; Engineering Geology Observations, Bull. Seismol. Soc. Am.61, 511–533.
Davies, T. R. (1982),Spreading of Rock Avalanche Debris by Mechanical Fluidization, Rock Mechanics15, 9–24.
Eason, G. (1965),The Stresses Produced in a Semi-infinite Solid by a Moving Surface Force, Int. J. Eng. Sci.2, 581–609.
Foda, M. A. (1993),Landslides Riding on Basal Pressure Waves, to appear in Continuum Mechanics and Thermodynamics.
Habib, P. (1975),Production of Gaseous Pore Pressure during Rock Slides, Rock Mechanics7, 193–197.
Kent, P. E. (1966),The Transport Mechanism in Catastrophic Rock Falls, J. Geology74, 79–83.
Melosh, H. J. (1979),Acoustic Fluidization: A New Geologic Process?, J. Geophys. Res.84, (B13), 7513–7520.
Melosh, H. J. (1986),The Physics of Very Large Landslides, Acta Mechanica64, 89–99.
Okuda, S., Okunishi, K., Suwa, H., Yokoyama, K., andYoshida, R. (1985),Restoration of Motion of Debris Avalanche at Mt. Ontake in 1984 and Some Discussions on its Moving State, Disaster Prevention Res. Inst. Annuals, Kyoto Univ.24A, 491–504 (in Japanese).
Plafker, G., Ericksen, G. E., andConcha, J. F. (1971),Geological Aspects of the May 31, 1970, Peru Earthquake, Bull. Seismol. Soc. Am.61, 543–578.
Sassa, K. (1988),Geotechnical Model for the Motion of Landslides, Special lecture, Proc. 5th Intern. Symp. on Landslides, 37–55.
Scheidegger, A. E. (1973),On the Prediction of the Reach and Velocity of Catastrophic Landslides, Rock Mechanics5, 231–236.
Shreve, R. L. (1968),The Blackhawk Landslide, Geol. Soc. Am. Spec. Paper108.
Takarada, S. (1991),Flow and Depositional Mechanisms of Debris Avalanche — A Case Study of Iwasegawa Debris Avalanche Deposit, Tashirogawa Volcano, Northern Japan, Bull. Volcanol. Soc. Japan36, 11–23 (in Japanese).
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Kobayashi, Y. Effect of basal guided waves on landslides. PAGEOPH 142, 329–346 (1994). https://doi.org/10.1007/BF00879308
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DOI: https://doi.org/10.1007/BF00879308