Effect of flow -independent viscosity on the propagation of Rayleigh wave in porous media

The propagation characteristics of Rayleigh wave near the surface of fluid-saturated poroviscoelastic medium are investigated in this paper. The effective stress in porous media is defined by the linear viscoelasticity theory based on Biot model and Kelvin-Voigt model. The dispersion equations of Rayleigh wave are derived analytically and then solved numerically to obtain its propagation speed and attenuation coefficient in the poroviscoelastic solid half-space. The effects of relaxation time and viscous coupling on the dispersion and attenuation of the Rayleigh wave as well as the body waves are discussed. The results indicate that the flow-independent viscosity has important influence on the propagation characteristics of Rayleigh waves, compared with the flowdependent effect of viscous coupling between the pore fluid and solid skeleton.

Automated summary

This paper investigates the propagation characteristics of Rayleigh waves near the surface of fluid-saturated poroviscoelastic medium. The study shows that flow-independent viscosity has a significant impact on the propagation of waves.