Validation of a new endochronic liquefaction model for granular soil by using centrifuge test data

摘要

The application of a new liquefaction constitutive model, based on the endochronic theory applied to densification of sandy soil, to a set of centrifuge tests from the University of British Columbia, is presented in this paper. The model employed herein takes into account, in a unified formulation, contractive and dilative behaviours, and considers the soil collapse as well. First of all, the model is calibrated by means of undrained cyclic simple shear stress test data. The constitutive law of the soil is implemented in the bidimensional coupled finite element code CMLIQ (Cyclic Mobility and LIQuefaction), developed by the authors. Three centrifuge tests are analysed, the seismic loading and the geometry being the same for all of them, namely an improved slope with drain devices or denser soil at some locations. Comparisons between the data provided by the numerical model and the experimental measurements are shown, and, as a result, the accuracy of the model is explored and evaluated.