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Dynamical weakening of pyroclastic flows by mechanical vibrations

Opened Access Dynamical weakening of pyroclastic flows by mechanical vibrations

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Autor: Valverde Millán, José Manuel
Soria del Hoyo, Carlos
Roche, Olivier
Departamento: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Fecha: 2017
Publicado en: 8th International Conference on Micromechanics on Granular Media, Powders and Grains (2017), p 12001-.
ISBN/ISSN: 2101-6275
Tipo de documento: Ponencia
Resumen: Dynamical weakening of dense granular flows plays a critical role on diverse geological events such as seismic faulting and landslides. A common feature of these processes is the development of fluid-solid relative flows that could lead to fluidization by hydrodynamic viscous stresses. Volcanic ash landslides (pyroclastic flows) are characterized by their high mobility often attributed to fluidization of the usually fine and/or low-density particles by their interaction with the entrapped gas. However, the physical mechanism that might drive sustained fluidization of these dense granular flows over extraordinarily long runout distances is elusive. The behavior of volcanic ash in a slowly rotating drum subjected to mechanical vibrations shown in this work suggests that fluid-particle relative oscillations in dense granular flows present in volcanic eruption events can promote pore gas pressure at reduced shear rates as to sustain fluidization.
Cita: Valverde Millán, J.M., Soria del Hoyo, C. y Roche, O. (2017). Dynamical weakening of pyroclastic flows by mechanical vibrations. En 8th International Conference on Micromechanics on Granular Media, Powders and Grains (12001-), Montpellier, France: EDP Sciences.
Tamaño: 4.067Mb
Formato: PDF

URI: https://hdl.handle.net/11441/69773

DOI: 10.1051/epjconf/201714012001

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