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SANISAND-F

For the validation of the implementation of the SANISAND-F 1 constitutive model available in numgeo, a comparison with the simulation results obtained with the ConModel program and provided by Taiebat & Sheng (University of British Columbia, Vancouver, Canada). The SANISAND-F implementation in numgeo currently offers access to two different integration schemes:

  • Modified-Euler: explicit integration scheme with adaptive time integration and error control
  • Forward-Euler: explicit integration scheme with constant substep size

The validation of the implementation was performed based on simulations of a total of eight undrained triaxial tests (Fig. 3 in Bokkisa et al. (2022)2):

  • Undrained triaxial compression tests

    • \(e_{0}\)=0.89, \(p_0\)=50 kPa
    • \(e_{0}\)=0.978, \(p_0\)=100 kPa
    • \(e_{0}\)=0.863, \(p_0\)=300 kPa
    • \(e_{0}\)=0.861, \(p_0\)=500 kPa

  • Undrained triaxial extension tests

    • \(e_{0}\)=0.876, \(p_0\)=50 kPa
    • \(e_{0}\)=0.888, \(p_0\)=100 kPa
    • \(e_{0}\)=0.866, \(p_0\)=300 kPa
    • \(e_{0}\)=0.860, \(p_0\)=500 kPa

The simulation results obtained with the ConModel and provided by Taiebat & Sheng are used as reference.

Input files

The input files for the benchmark simulations can be downloaded here (ME) and here (FE).

Modified Euler

Simulation results of undrained triaxial compression (solid lines) and extension (dashed lines) tests. Coloured: numgeo with modified euler integration scheme, grey: reference.

triax_CU_ME

Forward Euler

Simulation results of undrained triaxial compression (solid lines) and extension (dashed lines) tests. Coloured: numgeo with forward euler integration scheme, grey: reference.

triax_CU_FE

  1. A. L. Petalas, Y. F. Dafalias, und A. G. Papadimitriou, „SANISAND-F: Sand constitutive model with evolving fabric anisotropy“, International Journal of Solids and Structures, Bd. 188–189, S. 12–31, Apr. 2020, doi: 10.1016/j.ijsolstr.2019.09.005. ↩

  2. S. V. Bokkisa, J. Macedo, A. L. Petalas, und C. Arson, „Assessing static liquefaction triggering considering fabric anisotropy effects under the ACST framework“, Computers and Geotechnics, Bd. 148, S. 104796, Aug. 2022, doi: 10.1016/j.compgeo.2022.104796. ↩