Dispersion of Torsional Surface Wave in a Pre-stress Anisotropic Porous Medium With Rigid and Traction Free Boundary Surface Over Sandy Half-Space

In this article, an endeavor has been made to infer the dispersion equation of the torsional surface wave in a pre-stressed an anisotropic porous medium over a dry sandy semi-limitless medium. The case insightful investigation of rigid boundary and traction free boundary surface of the upper layer has been examined in points of interest. The elastic equations of motion have been defined independently for different media utilizing Biot's hypothesis. The dispersion equations of motion for both cases have been acquired under the suitable limit condition in the term of Whittaker function and its derivatives.