Validation of a new constitutive model with reversal surfaces for the analysis of liquefaction-induced phenomena

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4. Validation of a new constitutive model with reversal surfaces for the analysis of liquefaction-induced phenomena

This paper presents the validation of a new constitutive model with reversal surfaces in accurately predicting the soil response in boundary value problems (BVPs) related to liquefaction. The new model, named LiPa model, has been implemented in finite difference codes FLAC and FLAC3D, via their User-Defined-Model mode, for numerical analyses in the 2D and 3D space respectively. The validation of the new model is presented for two BVPs of slightly inclined liquefiable soil profiles susceptible to lateral spreading, including: a) the seismic response of a uniform liquefiable sand layer and b) the simulation of a pile group response in a three-layered liquefiable soil profile. The validation is based on comparisons with measurements from centrifuge experiments, where Nevada sand is used as the basic sand material. In both studied cases a unique set of model constants is adopted, that is derived after a thorough calibration against monotonic, dynamic and cyclic element tests on Nevada sand. It is shown that the new model can predict qualitatively, but also quantitively, all aspects of the response, namely ground accelerations, excess pore pressures and ground (and pile) displacements with a single set of model constants and by following the same numerical methodology, despite the different case-specific conditions.

10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)

1. Constitutive modelling for saturated and unsaturated soils