Dynamic Characteristics of Shear-Horizontal Waves in Porous Sandwich Systems

Abstract

This paper presents an analytical investigation of shear-horizontal (SH) wave propagation in an inhomogeneous dual-porous layer sandwiched between a viscous sandy medium and a cracked poroelastic half-space.  The dual-porous layer is saturated with a heterogeneous fluid and combines both matrix and fracture porosities, enabling a realistic simulation of complicated subsurface formations.  The proposed model accounts for material inhomogeneity, solid–fluid interaction, and porous dissipation mechanisms in both the dual-porous layer and the cracked poroelastic medium.  Imperfect mechanical interfaces are added at the boundary surfaces to reflect partial bonding conditions, with their consequences defined by nondimensional interfacial stiffness parameters.  The influences of interfacial imperfection, fracture volume percentage, porosity, density contrast, and layer thickness ratio on SH-wave dispersion and attenuation are explored in depth.  The results demonstrate that both interfacial stiffness and geometrical configuration greatly affect the wave propagation characteristics, revealing the strong sensitivity of SH waves to interfacial circumstances and microstructural features.  The established solid–fluid coupled framework gives better physical insight into wave–medium interaction processes and offers a rigorous theoretical basis for nondestructive evaluation, seismic interpretation, and geophysical exploration in layered porous media. features. This solid–fluid coupled theoretical framework provides deeper physical insight into the wave–medium interaction mechanisms and establishes a foundation for nondestructive evaluation, seismic interpretation, and geophysical exploration in layered porous systems.