Cap Model Guided By Energy Concept

by Shoji E. Yamada, Staff Consultant; Terra Tek, Inc., Salt Lake City, Utah,
Ahmed S. Abou-Sayed, Staff Consultant; Terra Tek, Inc., Salt Lake City, Utah,

Serial Information: Journal of the Geotechnical Engineering Division, 1979, Vol. 105, Issue 2, Pg. 183-200

Document Type: Journal Paper


The mathematical equivalence between the cap model in general and the constant pseudo-complementary energy surface defined by the stress deviation from a certain hydrostatic stress state is shown. This hydrostatic stress is proportional to the so-called hardening parameter in other literature. Consequently, the determination of a material parameter (the aspect ratio of the elliptical cap) is reduced to the measurement of the unloading elastic constants. Based on this analysis, a simple experimental approach to determine the parameters required for the cap model to represent polyaxial behavior of soils and rocks is presented.

Subject Headings: Parameters (statistics) | Hydrostatics | Soil analysis | Mathematical models | Terrain models | Hydrologic models | Stress analysis | Hydro power

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