Evaluation of three advanced constitutive models for cyclic loading of sands

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4. Evaluation of three advanced constitutive models for cyclic loading of sands

The present work examines the advantages and disadvantages of two widely known constitutive modelling ap-proaches for cyclic loading simulations: i) multi-surface plasticity and ii) bounding surface plasticity. Two multi-surface models and one bounding surface model are implemented and calibrated and their performance at a single element level is examined. Emphasis is placed on the performance of two multi-surface models, namely a series model for cohesionless soils employing nested kinematic hardening yield surfaces, and a parallel Iwan model capable of predicting a Masing-type nonlinear hysteretic response without the need for translating surfaces. The latter, PIMSS (Parallel Iwan Multi-Surface Sand), is a new effective stress model for sands and hence its formulation is briefly described. The predictive capability and ease of calibration of the two multi-surface models are discussed. These models are then compared with a commonly used version of the bounding surface model SANISAND. The model predictions are assessed for drained and undrained monotonic and cyclic undrained triaxial tests focusing on key points such as the phase transformation behaviour of denser sands, stress attractor at liquefaction state and stiffness degradation during undrained cyclic loading.

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

1. Constitutive modelling for saturated and unsaturated soils