Compressional wave speed and absorption measurements in a saturated kaolinite-water artificial sediment.
Martinek, Charles Allen
Andrews, Robert S.
Wilson, O.B. Jr.
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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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