Application of New Bounding Surface Plasticity Model for Cyclic Loading of Satuarted Sands

Abstract eng:
Cyclic response of geomaterials is complex due to the pressure and specific volume dependency of the stress-stain relationship and the highly nonlinear behavior of the soil. This is particularly the case under undrained conditions in granular soils, where repeated loading and unloading can lead to a substantial rise in the pore water pressure and a sudden loss in the shear strength and the stiffness of the soil. Concerted efforts have been made to develop some plasticity models to predict non-linear behavior of soils. Conventional plasticity models such as Cam clay always assume a fixed shape of yield surface with a purely elastic interior domain, associative flow rule and using isotropic hardening rule for the evolution of the yield surface. These attributes lead to conceptually simple, non-rigorous and computationally efficient models. Cam clay model has some weakness, such as overestimating peak strength of over-consolidated clays and dense sands and unable to predict the static liquefaction failure observed in undrained loading of loose sands. Assumption of a purely elastic domain inside the yield surface limits the ability of these models to predict plastic deformations during unloading and subsequent reloading stages of a cyclic loading, which can lead to dynamic liquefaction in loose sand. This research is aimed to use bounding surface plasticity model to predict non-linear behavior of saturated soil subjected to dynamic loading. This method is computationally simple, uses fewer model parameters and results of the simulation fit experimental data with reasonable accuracy.

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