Measurement of the Viscoelastic and Related Mass-Physical Properties of Some Continental Terrace Sediments

摘要

The complex rigidity of 20 samples of continental terrace clayey-silt sediments has been measured in the laboratory using a viscoelastometer in the frequency range from 4 to 38 kHz. The method involves measuring the effects on torsional waves propagating in a rod due to shear loading of the side walls of the rod when it is imbedded in the sediment. Values of the real component of rigidity range from 650,000 to 26,000,000 dynes/sq cm. Values of the imaginary component of rigidity fall between 290,000 and 8,200,000 dynes/sq cm. No clear-cut dependence of rigidity upon frequency is observed. Both real and imaginary components of rigidity are analyzed by plotting the data as a function of various other mass-physical properties, including: density, porosity, compressional sound speed, sand-silt-clay percentages, montmorillonite, chlorite, illite percentages, vane shear strength, Poisson's ratio, and the product of density and sound speed squared. These analyses indicate that both real and imaginary components of ragidity exhibit trends with some of the mass-physical properties. (Author)