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In this article, the modified Hardening Soil model which is imple-mented in GEO5 FEM software with the Matsuoka-Nakai failure criterion and a modified stiffness dependency on the mean stress to mitigate the problem of stress rotation with the original Hardening Soil model is discussed. A calibration scheme is presented which identifies values of all parameters of the model. The calibration is based on analysis of laboratory data containing compression and triaxial shear tests and prioritizes the physical meanings of each parameter and utilizes an optimization of the objective error function where advantageous. The calibration is currently implemented in the free-to-use online application ExCal-ibre. Example of calibration results for sand specimen is presented.

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On The Automated Calibration of Elastoplasticity Constitutive Model: The Hardening Soil

  • 会议论文

  • 发表日期：

    2025年

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  • Phuong Chinh Do,
  • Tomas Kadlicek,
  • David Masin,
  • Jan Najser

摘要

In this article, the modified Hardening Soil model which is imple-mented in GEO5 FEM software with the Matsuoka-Nakai failure criterion and a modified stiffness dependency on the mean stress to mitigate the problem of stress rotation with the original Hardening Soil model is discussed. A calibration scheme is presented which identifies values of all parameters of the model. The calibration is based on analysis of laboratory data containing compression and triaxial shear tests and prioritizes the physical meanings of each parameter and utilizes an optimization of the objective error function where advantageous. The calibration is currently implemented in the free-to-use online application ExCal-ibre. Example of calibration results for sand specimen is presented.