One-point integrated hourglass-enhanced u-U elements with mortar fluid-phase contact and Sanisand interface
One-point integrated hourglass-enhanced u-U elements with mortar fluid-phase contact and Sanisand interface
Realistic simulation of coupled geotechnical boundary value problems using the finite element method places high demands on element formulations, constitutive soil models and interface modelling. This applies to their (mathematical) formulation as well as their (robust) implementation. A novel two-phase Mortar contact is presented which allows to accurately model interface behaviour for element formulations discretising both the solid- and the water-displacement (u-U formulation). For the latter, a one-point integration is presented, which prevents locking for nearly constant volume conditions. The robustness and capability of the implementations are demonstrated by the back-calculation of a shaking-table centrifuge test. The Sanisand-04 constitutive model is used herein to describe both the soil and the soil-structure interface behaviour. The results of the u-U elements are compared to results obtained with (classical) u-p elements.
J. Machacek; P. Staubach
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/NUMGE2023-168
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