Automated calibration of advanced soil constitutive models. Part I: hypoplastic sand

This paper discusses an automated deterministic approach to parameters calibration of the hypoplastic model for sand. The calibration is performed on results from basic laboratory experiments such as the oedometric test, isotropic compression test, and the drained and undrained triaxial shear tests. The calibration method is structured in a hierarchical order and implemented into a free-to-use online application called ExCalibre. The method is based on the sensitivity study performed prior to the development of the calibration method. The calibration procedure respects the physical meaning of the calibrated parameters and their influence on the stiffness and asymptotic states, rather than performing a blind optimization of an objective function.