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Article

Shear Wave Splitting and Polarization in Anisotropic Fluid-Infiltrating Porous Media: A Numerical Study

1
Department of Civil, Environmental and Architectural Engineering, University of Padua, Via Marzolo 9, 35131 Padua, Italy
2
Department of Civil Engineering and Engineering Mechanics, Columbia University, 614 SW Mudd, 4709, New York, NY 10027, USA
3
Department of Management and Engineering, University of Padua, Stradella San Nicola 3, 36100 Vicenza, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(21), 4988; https://doi.org/10.3390/ma13214988
Received: 29 September 2020 / Revised: 29 October 2020 / Accepted: 30 October 2020 / Published: 5 November 2020
The triggering and spreading of volumetric waves in soils, namely pressure (P) and shear (S) waves, developing from a point source of a dynamic load, are analyzed. Wave polarization and shear wave splitting are innovatively reproduced via a three-dimensional Finite Element research code upgraded to account for fast dynamic regimes in fully saturated porous media. The mathematical–numerical model adopts a u-v-p formulation enhanced by introducing Taylor–Hood mixed finite elements and the stability features of the solution are considered by analyzing different implemented time integration strategies. Particularly, the phenomena have been studied and reconstructed by numerically generating different types of medium anisotropy accounting for (i) an anisotropic solid skeleton, (ii) an anisotropic permeability tensor, and (iii) a Biot’s effective stress coefficient tensor. Additionally, deviatoric-volumetric coupling effects have been emphasized by specifically modifying the structural anisotropy. A series of analyses are conducted to validate the model and prove the effectiveness of the results, from the directionality of polarized vibrations, the anisotropy-induced splitting, up to the spreading of surface waves. View Full-Text
Keywords: porous media; Biot’s theory; acoustics; shear wave splitting; slow wave porous media; Biot’s theory; acoustics; shear wave splitting; slow wave
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MDPI and ACS Style

De Marchi, N.; Sun, W.; Salomoni, V. Shear Wave Splitting and Polarization in Anisotropic Fluid-Infiltrating Porous Media: A Numerical Study. Materials 2020, 13, 4988. https://doi.org/10.3390/ma13214988

AMA Style

De Marchi N, Sun W, Salomoni V. Shear Wave Splitting and Polarization in Anisotropic Fluid-Infiltrating Porous Media: A Numerical Study. Materials. 2020; 13(21):4988. https://doi.org/10.3390/ma13214988

Chicago/Turabian Style

De Marchi, Nico, WaiChing Sun, and Valentina Salomoni. 2020. "Shear Wave Splitting and Polarization in Anisotropic Fluid-Infiltrating Porous Media: A Numerical Study" Materials 13, no. 21: 4988. https://doi.org/10.3390/ma13214988

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