Abstract
The frame bulk modulus is important in analyzing the acoustic wave propagation in granular marine sediments. The frame bulk modulus is related to the longitudinal and shear wave velocities. We have reported that the derived values of the frame bulk moduli of air- and water-saturated glass beads are different. In this study, the longitudinal and shear wave velocities in air- and water-saturated beach sands, and in same media in vacuum, are measured. Then the frame bulk moduli are derived from the values of these velocities. The results show that the frame bulk moduli in water-saturated beach sands are about ten times greater than that in air-saturated beach sands, and the frame bulk moduli have dependence on the grain size. These phenomena are investigated using the idea of the gap stiffness between the grains.
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