Compressional wave speed and absorption measurements in a saturated kaolinite-water artificial sediment.
compressionalwav00mart.pdf (2.305Mb)Abstract
The absorption coefficient for compressional waves in a water-saturated
kaolinite clay was measured in the frequency range 100 to
150 kHz using a pulse technique with spherically diverging waves. The
measurement also permitted determination of the sound speed, V . For
one condition of the clay with a 77% porosity, the sound speed was
1422 m/sec. The absorption coefficient, a, was found to be frequency
dependent, satisfying the empirical relationship a = 0.033 f dB/m, f
being the frequency in kHz. No dispersion of wave speed with frequency
was observed. These results were used together with the results of
dynamic shear (rigidity) modulus measurements made with a torsional wave
viscoelastometer to calculate the complex Lame constants of a viscoelastic
model.
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