Abstract
Hypoplastic constitutive models are able to describe history dependence using a single nonlinear tensorial function with a set of parameters. A hypoplastic model including a structure tensor for consolidation history was introduced in our previous paper (Wang and Wu in Acta Geotechnica, 2020, https://doi.org/10.1007/s11440-020-01000-z). The present paper focuses mainly on the model validation with experiments. This model is as simple as the modified Cam Clay model but with better performance. The model requires five parameters, which are easy to calibrate from standard laboratory tests. In particular, the model is capable of capturing the unloading behavior without introducing loading criteria. Numerical simulations of element tests and comparison with experiments show that the proposed model is able to reproduce the salient features of normally consolidated and overconsolidated clays.
Highlights
Overconsolidation is one of the most important factors that significantly influence the mechanical behavior of overconsolidated (OC) clays
The model parameters should possess clear physical meaning, and secondly, the model parameters should be independent of the initial states, such as the initial confining pressure and the initial overconsolidation ratio (OCR)
Many elastoplastic models can properly describe the mechanical behavior of OC clays using a set of model parameters
Summary
Overconsolidation is one of the most important factors that significantly influence the mechanical behavior of overconsolidated (OC) clays. One of the main considerations for the evaluation of the models is that the model parameters can be obtained from conventional laboratory tests. A series of hypoplastic models for fine-grained soils were proposed by Mas ́ın [16, 18, 19]. These models open a new avenue for modeling of OC clays. The parameters of the basic hypoplastic model are calibrated for clays. This leads to a reduction of the constitutive parameters, which are easy to calibrate from conventional laboratory experiments. The model is validated by comparing the numerical predictions with experiments on different OC clays
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