Wave propagation and the frequency domain Green's functions in viscoelastic Biot/squirt (BISQ) media


Autoria(s): 杨顶辉; 申义庆; Liu ER
Data(s)

2007

Resumo

In this paper, we examine the characteristics of elastic wave propagation in viscoelastic porous media, which contain simultaneously both the Biot-flow and the squirt-flow mechanisms (BISQ). The frequency-domain Green's functions for viscoelastic BISQ media are then derived based on the classic potential function methods. Our numerical results show that S-waves are only affected by viscoelasticity, but not by squirt-flows. However, the phase velocity and attenuation of fast P-waves are seriously influenced by both viscoelasticity and squirt-flows; and there exist two peaks in the attenuation-frequency variations of fast P-waves. In the low-frequency range, the squirt-flow characteristic length, not viscoelasticity, affects the phase velocity of slow P-waves, whereas it is opposite in the high-frequency range. As to the contribution of potential functions of two types of compressional waves to the Green's function, the squirt-flow length has a small effect, and the effects of viscoelastic parameter are mainly in the higher frequency range. Crown Copyright (C) 2006 Published by Elsevier Ltd. All rights reserved.

Identificador

http://dspace.imech.ac.cn/handle/311007/33943

http://www.irgrid.ac.cn/handle/1471x/2820

Idioma(s)

英语

Fonte

International Journal of Solids and Structures.2007,44(14-15):4784-4794

Palavras-Chave #Biot/Squirt (Bisq) Model #Poroelasticity #Viscoelastic Media #Wave Propagation #Green'S Function #Elastic-Waves #Squirt #Scattering #Model #Biot
Tipo

期刊论文