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Soil Viscoelasticity: Superposition Tests¹

ABSTRACT

Viscoelasticity is a linear deformation theory in which time-dependence of stress-strain ratios conforms to the Boltzmann superposition principle. Three types of superposition tests were made on briquets of Yolo silt loam subjected to torsional deformation. The principle was found to be valid when stress, stress duration, and soil water content were kept below certain limits. Deviation from linear behavior as these limits were exceeded first appeared as non-Newtonian flow rather than as non-Hookean (instantaneous) elastic response. Where the principle applies, there is a structural stability under deformation which makes viscoelasticity promising for relating mechanical behavior to soil-water structure.

¹ Contribution from Dept. of Soils and Plant Nutrition, Univ. of California, Berkley.

² Assistant Professor of Soil Physics and Assistant Soil Physicist in the Experiment Station.

Received for publication August 21, 1963. Accepted for publication December 9, 1963.