Abstract
The frame bulk and shear moduli are important in analyzing the acoustic propagation in marine sediments. However, the studies on these moduli are not considered to be sufficient. The frame bulk and shear moduli of marine sediments are related to the longitudinal and shear wave velocities in dry marine sediments. In this paper, the longitudinal and shear wave velocities in dry glass beads with five different grain sizes are measured to investigate the effect of grain size. The grain sizes are 0.05, 0.1, 0.2, 0.4, and 0.8 mm. The longitudinal wave velocities are measured using piezoelectric transducers with the operating frequency of 11.8 kHz. The shear wave velocities are measured using bimorph-type piezoelectiric transducers with an operating frequency of 3.5 kHz. The measured results show that the longitudinal wave velocity largely increases and the shear wave velocity slightly increases as the grain size increases.
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