Wave Propagation in Saturated and Partially Saturated Porous Media

摘要

The aim was to verify and improve models describing wave propagation and dampingin partially saturated porous media. A survey of the two phase theory for wave propagation in fully saturated elastic media, which is usually denoted by the Biot theory is given. Computational results for wave propagation and damping in a cylindrical porous sample are presented. The damping mechanisms of vibrating gas bubbles on a porous system are discussed. Darcy damping, thermal damping, viscous damping, and acoustic damping are treated. The effects of oscillating gas bubbles in wave propagation and damping are considered. The dynamic compressibility of the pore fluid is introduced. The dynamic interaction between pore fluid and solid, a subject of interest for wave propagation in both fully and partially saturated porous media, is discussed. A dynamic permeability parameter is introduced. Experimental determination of the properties of the porous media and the preparation of a partially saturated column are discussed. An experimental determination of dynamic permeability is presented. Wave experiments performed on saturated and partially saturated porous media are discussed.