The use of surface wave techniques for verification of dynamic rigidity measurements in a kaolinite-water artificial sediment

Compressional wave speed and absorption measurements in a saturated kaolinite-water artificial sediment

“…Although Walsh [18] had arrived at a value for the shear wave speed (V ) of approximately 23 m/sec, both Cohen's values and the measurements reported here indicate that a shear wave speed of less than 5 m/sec is more realistic for the very soft sediment being studied. Values for y and y' were calculated using the following viscoelastic equations [3] and experimental data: V is small.…”

“…THE VISCOELASTOMEIER The description, theory, and operation of the viscoelastometer have been thoroughly reported by Lasswell [17] , Bieda [11] , Walsh [18] and others. The viscoelastometer, as shown in Fig.…”

“…Cohen [10] and Walsh [18] both observed ratios greater than 0.98 for kaolinite-water sediments with approximately the same porosity. Data collected by Hamilton [20] for shallow water sediments off San Diego gave a sound speed ratio of 0.97 or greater.…”

“…Attempts to duplicate Walsh's [18] measurements of surface waves were in vain. Although basically the same equipment and procedures were used, a surface wave could not be observed in this sediment.…”

“…Walsh [18] . However, these measurements were made with a layer of water overlying it while, in Walsh's experiments, the sediment was covered with a thin film of water and the surficial layers were much stiffer.…”