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Failure of levees induced by toe uplift:Investigation of post-failure behavior using material point method

Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 970-983页

作者： Veronica Girardi Francesca Ceccato Alex Rohe paolo simonini Fabio Gabrieli University of Padua Department of CivilEnvironmental and Architectural EngineeringVia Ognissanti 39PaduaItaly GeoHal Graswinckelstraat 50DelftNetherlands

Levees are essential structures in flood defense systems,and their failures can lead to devastating consequences on the surrounding *** of the failure mechanisms mostly controlled by the foundation soil stratigraphy is the instability of the land side slope,triggered by the development of high uplift pressures in the *** complex phenomenon has been investigated experimentally with centrifuge tests or large-scale tests and numerically with the limit equilibrium method(LEM)and the finite element method(FEM).In this work,we applied a multiphase formulation of the material point method(MPM)to analyze the development of toe uplift instability mechanism,from the onset of failure to large *** numerical model is inspired by an experiment carried out in a geotechnical centrifuge test by Allersma and Rohe(2003).The comparison with the experiment allows for understanding critical pore pressure triggering large displacements in the foundation ***,we numerically evaluated the impact of different values of foundation soils’hydraulic conductivity on the failure *** results show that hydraulic conductivity mainly influences the time of failure onset and the extension of shear localization at ***,the advantages of using large displacement approaches in the safety assessment of earth structures are *** FEM,there are no issues with element distortions generating difficulties with numerical convergence,allowing for full postfailure *** capability permits precise quantification of earth structure damages and post-failure *** ensuing reinforcement systems’design is no longer over-conservative,with a significant reduction in associated costs.

关键词： Slopes safety assessment Levees Uplift pressure Large deformation analysis

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