Discrete numerical analysis of cyclic loading on a model sand
Discrete numerical analysis of cyclic loading on a model sand
Discrete element method (DEM) is adopted in this work to characterize the behaviour of Fontainebleau sand NE34 under cyclic stress. For that YADE, an open-source software, is used where a linear contact model is utilized. The effect of anisotropic particle shape is modelled by a rolling resistance moment. The model parameters are first calibrated to reproduce experimental data from drained monotonic triaxial tests on NE34. Then, a series of drained cyclic triaxial tests is carried out on an elementary volume sample in homogeneous conditions where the cyclic stress ratio and the density index ID of the sample vary between different tests. The small strains properties, shear modulus G and damping ratio D, are then evaluated and compared with experimental data from the literature. The accumulation of irreversible deformations is also characterized. Finally, a micro-mechanical analysis of fabric evolution and force transmission allows to link the observed macroscopic behaviour to phenomena at the grain scale, depending on the stress level and ID initially set.
Alice Ezzeddine; Bogdan Cazacliu; P. Richard Ray; Luc Thorel; Riccardo Artoni
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
2. Finite element, finite difference, discrete element, material point and other methods
https://doi.org/10.53243/NUMGE2023-218
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