The modelling and simulation of cyclic sand ratcheting is tackled by means of a plasticity model formulated within the well-known critical state, bounding surface SANISAND framework. For this purpose, a third locus - termed the 'memory surface' - is cast into the constitutive formulation, so as to phenomenologically capture micro-mechanical, fabric-related processes directly relevant to the cyclic response. The predictive capability of the model under numerous loading cycles ('high-cyclic' loading) is explored with focus on drained loading conditions, and validated against experimental test results from the literature - including triaxial, simple shear and cyclic loading by oedometer test. The model proves capable of reproducing the transition from ratcheting to shakedown response, in combination with a single set of soil parameters for different initial, boundary and loading conditions. This work contributes to the analysis of soil-structure interaction under high-cyclic loading events, such as those induced by environmental and/or traffic loads.
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ACKNOWLEDGEMENTS The authors wish to acknowledge the China Scholarship Council (CSC) and the Geo-Engineering Section of Delft University of Technology for financial support of the first author.
© 2018 Thomas Telford Ltd.
- constitutive relations
- numerical modelling
- offshore engineering