Generalized Phenomenological Cyclic Stress-Strain-Strength Characterization of Anisotropic Granular Media.
Annual rept. 1 May-1 Jun 85,
FLORIDA UNIV GAINESVILLE DEPT OF CIVIL ENGINEERING
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This study was an analytical an experimental investigation into the influences of material anisotropy and principal plane rotation on the stress-strain and strength behavior of granular soil Reid-Bedford Sand. The laboratory investigation entailed the performance of approximately fifteen triaxial tests under conventional compression and extension loading, and five through initial shear, followed by hydrostatic compression. The initial tests with an additional fifteen experiments were used in characterizing the influence of inherent anisotropy and principal plane rotations on material response. The latter were employed to delineate the affects of stress-induced anisotropy. A review of existing elasto-plastic theory as related to soil mechanics showed only a few models of a phenomenological nature which of the multi-surface isotropickinematic hardening characterizations, Prevosts pressure sensitive model, was used in the prediction of the hollow cylinder tests. Although the model reasonably reproduced the response along its calibration path, it did not quantitatively or qualitatively predict the laboratory results along other stress paths which involved principal plane rotations. The report concludes with a discussion on the significant influence of anisotropy on the stiffness, strength, and plastic flow rate direction of granular media, and the need for improved analytical representation.
- Soil Mechanics