超音波パルス法による含水ガラスビーズ焼結体中のP1, P2, S波の位相速度の測定

抄録

By using an ultrasonic mode conversion method, phase velocities are measured for three kinds of bulk waves (first and second compressional waves and shear wave) propagating through a water-saturated sintered glass bead plate immersed in water. The observation of the second compressional wave confirms Biot's prediction of its existence. It is also shown that its measured velocities are in good agreement with those predicted by the Biot theory and Berryman's self-consistent model for effective moduli, and that the phase velocities obtained for the first compressional and shear waves fall between the two curves predicted based on the two self-consistent models, that is, Wu's (static)one and Berryman's (dynamic) one. In addition to the velocities, values of a dynamic tortuosity parameter are also obtained.