Propagation of seismic waves through liquefied soils |
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| Authors: | Mahdi Taiebat Boris Jeremi? Yannis F Dafalias Amir M Kaynia Zhao Cheng |
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| Institution: | 1. Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada V6T 1Z4;2. Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;3. Department of Mechanics, National Technical University of Athens, Zographou 15780, Hellas;4. Norwegian Geotechnical Institute, P.O. Box 3930 Ullevaal Stadion, N-0806 Oslo, Norway;5. Earth Mechanics Inc., Oakland, CA 94621, USA |
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| Abstract: | To predict the earthquake response of saturated porous media it is essential to correctly simulate the generation, redistribution, and dissipation of excess pore water pressure during and after earthquake shaking. To this end, a reliable numerical tool requires a dynamic, fully coupled formulation for solid–fluid interaction and a versatile constitutive model. Presented in this paper is a 3D finite element framework that has been developed and utilized for this purpose. The framework employs fully coupled dynamic field equations with a u–p–U formulation for simulation of pore fluid and solid skeleton interaction and a SANISAND constitutive model for response of solid skeleton. After a detailed verification and validation of the formulation and implementation of the developed numerical tool, it is employed in the seismic response of saturated porous media. The study includes examination of the mechanism of propagation of the earthquake-induced shear waves and liquefaction phenomenon in uniform and layered profiles of saturated sand deposits. |
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| Keywords: | Numerical analysis Wave propagation Earthquake Liquefaction Constitutive modeling |
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