Constitutive Model for a Thawing, Frost-Susceptible Sand

摘要

A material model for soft, wet soil was generated to simulate the deformation behavior of thawing soil under vehicle loading on paved and unpaved roads. Freeze-thaw action produces a loose, wet soil that undergoes large deformation when subjected to vehicle loads. The soil modeled is a frost- susceptible fine sand, which was used in full-scale tests of paved and unpaved road sections in CRREL's Frost Effects Research Facility (FERF). The soil was subjected to a full suite of saturated and unsaturated triaxial testing, using density, moisture, and loading conditions duplicating those experienced during the freeze-thaw testing in the FERF. Material parameters were generated for a capped Drucker-Prager plasticity model. These were calibrated in triaxial test simulations using the commercial finite element code ABAQUS. The material model was then implemented in several three-dimensional finite element simulations for validation and robustness. The model for Lebanon Sand was compared to the same model for other granular materials.