Comparison of a Microscopic Model and a Macroscopic Model Predictions on the Stress-Strain Behavior of a Soil

by Prasanna Ratnaweera, New Jersey Inst of Technology, Newark, United States,
Namunu J. Meegoda, New Jersey Inst of Technology, Newark, United States,

Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond


The stress-strain behavior of a soil under drained triaxial conditions was simulated using the Microscopic constitutive model TRUBAL. The model parameters for the Macroscopic constitutive (Bounding Surface) model was estimated by matching simulated stress-strain behaviors from TRUBAL and predicted stress-strain behavior from Bounding Surface Model. Using the same model parameters for both TRUBAL and Bounding Surface Model, the following stress-paths were predicted and compared: a) the plane-strain triaxial test, and b) the constant hydrostatic or constant-p triaxial test. It appears that there is a reasonable agreement between the predictions from the two approaches. Then an attempt was made to better understand the internal variables associated with the Macroscopic model.

Subject Headings: Terrain models | Simulation models | Triaxial loads | Bounding surface | Comparative studies | Stress strain relations | Soil stress | Parameters (statistics)

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