Sobol T. Distribution of bulk and surface waves in porous-elastic half-space

The dissertation is devoted to research of features of distribution of bulk and surface waves on free boundary of porous-elastic fluid-saturated a half-space and on interface a porous-elastic a half-space-liquid. Within the framework of model Bio а energy, dynamic and kinematics characteristics of bulk waves are analyzed. Is established, that the type of boundary conditions (permeable boundary or not) essentially influences process of reflection if the slow longitudinal wave transfers not less than 2% of energy of a incident wave. The analysis of distribution of surface waves on free boundary porous-elastic a half-space without taking into account attenuation and with attenuation is carried out. It is shown, that for permeable boundary the surface wave Rayleigh type exists not for all possible parameters of environment. The basic part of energy of a surface wave is concentrated in an elastic skeleton. For impermeable boundary the surface wave exists always. For the soft environment energy of this wave is concentrated in an elastic skeleton. For the rigid environment energy of such wave is concentrated in porous a liquid. The analysis of acoustic characteristics of surface waves on boundary porous-elastic a half-space-liquid for environments without attenuation is carried out. Existence of a surface wave such as Stoneley-Sholte and pseudo-surface waves - Stoneley- Sholte and Rayleigh is shown. It is established, that a surface wave such as Stoneley- Sholte, pseudo-surface waves Stoneley- Sholte and Rayleigh exists for the limited ratio of contacting materials. The energy of a wave as Stoneley-Sholte is concentrated in an elastic skeleton. It is shown, that depending on physical characteristics of contacting environments and boundary conditions situations when there are all three waves when there are only two of them or only one are possible.