N.S.Gorodetskaya Waves on the boundary of porous-elastic half-space. I. A free boundary |
Acoustic bulletin, Vol. 8 ¹ 1-2, (2005) |
| Peculiarities of surface wave propagation in liquid-saturated porous-elastic half-space with a free boundary are analyzed. It is shown that there is only surface wave with low attenuation in propagation direction for the half-space with permeable boundary, and the wave phase velocity insignificantly increases with the increase of frequency, approaching phase velocity of the surface wave in the equivalent monophase medium. The most of energy transferred by this wave is concentrated in the elastic skeleton. If the half-space boundary is impermeable, the two surface waves occur. One of them propagates with phase velocity close to that of the surface wave in the half-space with permeable boundary, and is low-attenuating one. The second wave attenuates significantly, and its high-frequency limit is the velocity of the slow longitudinal wave. The greater part of energy transferred by the first wave is concentrated in the elastic skeleton. The most of energy of the significantly attenuating wave is concentrated in the liquid. |
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KEY WORDS: surface wave, porous-elastic half-space, wave phase velocity, monophase medium, longitudinal wave |
| TEXT LANGUAGE: Russian |