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Modélisation physique et numérique de la micro-mécanique des milieux granulaires saturés. Application à la stabilité de substrats sédimentaires en génie cotier.

Abstract : The behaviour of multiphase materials covers a wide range of phenomena of interest to both scientists and engineers. The mechanical properties of these materials originate from all component phases, their distribution and interaction. A new coupled hydromechanical model is presented in this work, to be applied to the analysis of the hydrodynamics of saturated granular media. The model associates the discrete element method (DEM) for the solid phase, and a pore-scale finite volume (PFV) formulation of the flow problem. The emphasis of this model is, on one hand, the microscopic description of the interaction between phases, with the determination of the forces applied on solid particles by the fluid; on the other hand, the model involve affordable computational costs, that allow the simulation of thousands of particles in three dimensional models. The medium is assumed to be saturated of an incompressible fluid. Pore bodies and their connections are defined locally through a regular triangulation of the packings. The analogy of the DEM-PFV model and the classic Biot's theory of poroelasticity is discussed. The model is validated through comparison of the numerical result of a soil consolidation problem with the Terzaghi's analytical solution. An approach to analyze the hydrodynamic of a granular sediment is finally presented. The reproduction of the phenomenon of soil liquefaction is analysed and discussed.
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Submitted on : Wednesday, October 24, 2012 - 1:26:14 PM
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Emanuele Catalano. Modélisation physique et numérique de la micro-mécanique des milieux granulaires saturés. Application à la stabilité de substrats sédimentaires en génie cotier.. Sciences de la Terre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENU012⟩. ⟨tel-00743672⟩

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