Abstract
A study is made of the propagation of wave fronts in two types of fluid-filled porous media, anisotropic and isotropic. The characteristic equation governing wave propagation velocities in anisotropic media is obtained by using the notion of surfaces of discontinuity. It is found that the wave velocities in such media vary with the direction of propagation and that for a specified direction there are four different wave velocities with which the disturbances can propagate. When the material is isotropic, its frequency equation shows the existence of three distinct waves, two longitudinal waves and one shear wave with velocities independent of the direction of propagation. The decay equations derived for these waves indicate that there are two factors which influence the decay of waves in isotropic porous media. The first is the geometry of the wave front, and the second is the friction between the solid and fluid phases.
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