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Shear band and landslide dynamics in submerged and subaerial slopesKim, Sihyun 07 January 2016 (has links)
Submarine landslides, commonly triggered by earthquakes, significantly affect tsunami wave heights. Subaerial landslides can also generate tsunamis (if the land flows into a body of water) and may be catastrophic in nature, causing human casualties and direct property damage. This work focuses on landslides associated with shear band that develops beneath the slipping mass. Accordingly, we consider a landslide as a dynamic process when a shear band emerges along the potential failure surface. Within this band, the shear strength decreases due to the softening behaviour of the particulate material. Material above the band moves downwards, causing the band to propagate dynamically. This already produces a landslide velocity before the slide reaches the post-failure stage and begins separating from the substrata and generating tsunami. However, existing models of tsunamigenic landslides assume zero initial slide velocity.
Previous analyses of the catastrophic shear band propagation in slopes of normally- and over-consolidated sediments have shown that a relatively short initial failure zone is sufficient to cause a full-scale landslide. For the shear band to propagate, the energy produced in the body by an incremental propagation of the shear band must exceed the energy required for the propagation. This consideration separates the shear band growth into progressive (stable) and catastrophic (dynamic) stages and treats the band growth as a true physical process rather than an instantaneously appearing discontinuity.
This work considers a dynamic shear band problem formulated within the framework of the Palmer and Rice’s [1973] approach. We obtain the exact, closed-form solution for the shear band and landslide velocities as well as for the spatial and temporal distributions of strain and material velocity. This solution assesses when the slide fails due to the limiting condition near the propagating tip of the shear band. We also obtain a simple asymptotic solution, which is compared to the exact solution. In the case of submerged slopes, the obtained solutions are used in landslide and tsunami height analyses.
Our results suggest that the conventional static approach to the slope stability analysis leads to a significant underestimation of the slide size (volume). In most cases, the volumes of catastrophic slides are roughly twice the volumes of progressive slides. For submerged slides, this dynamic effect further manifests itself in increasing the tsunami magnitude compared to the static case.
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A study of latitudinal distributions of total electron content using radio signals from a transit satellite馬鴻健, Ma, Hung-kin, John. January 1971 (has links)
published_or_final_version / Physics / Master / Master of Science
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Micromechanisms of fracture under mixed mode I and II loadingBhattacharjee, Debashish January 1994 (has links)
No description available.
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Low frequency sound propagation in sea surface mixed layers in the presence of internal wavesPrior, Mark Kevan January 1996 (has links)
No description available.
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Corrosion fatigue of a high strength low alloy steelDonohoe, C. J. January 1999 (has links)
No description available.
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Fourth-order finite difference methods for the time-domain Maxwell equations with applications to scattering by rough surfaces and interfacesXie, Zhongqiang January 2001 (has links)
No description available.
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The influence of stone content and particle grading on strength characteristics for compacted soilIssa, Ahmed Ali January 2001 (has links)
No description available.
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The propagation of nonlinear waves in a bubbly liquidLeonard, S. R. January 1988 (has links)
No description available.
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Propagation of weak shock waves in nonlinear solidsFu, Y. January 1988 (has links)
No description available.
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Tissue culture and genetic transformation of Theobroma cacaoTan, Chia Lock January 2000 (has links)
No description available.
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