Considering the heterogeneity of argillaceous rock microstructure in a hydromechanical coupled double scale model

Pardoen, Benoît;Bésuelle, Pierre;Desrues, Jacques;Dal Pont, Stefano;Cosenza, Philippe
(2018) Microstructure de sols et des roches argileux – conséquences pour l’ingénieur (Journée Scientifique & Technique CFMS-CFMR) — Location: CNAM, Paris, France (25.October.2018)

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Authors
  • Pardoen, BenoîtUCLouvain
    Author
  • Bésuelle, PierreCNRS, Laboratoire 3SR
    Author
  • Desrues, JacquesCNRS, Laboratoire 3SR
    Author
  • Dal Pont, StefanoUniversité Grenoble Alpes, Laboratoire 3SR
    Author
  • Cosenza, PhilippeUniversité de Poitiers, IC2MP
    Author
Abstract
In the context of radioactive waste management, clay rocks are considered as favourable media for deep geological repositories. These rocks exhibit a complex multi-scale microstructure. Questions have risen on how microstructural characteristics of heterogeneous rocks can enrich the constitutive behaviour at macroscale. Consequently, the modelling of the hydro-mechanical behaviour of a clay rock is considered by taking into account its microstructural characteristics. The purpose is to develop a numerical approach taking into account the multi-scale behaviour of clay rocks and its effect at the structural scale in order to predict the deformations and failure. An approach is investigated for the modelling of the hydro-mechanical coupled behaviour of Callovo-Oxfordian claystone (COx), a potential host rock for deep repositories of radioactive wastes in France. The presented approach is a double-scale finite element method (FEMxFEM) using elementary areas (EA) to model the material behaviour at the microscale. The global response of the microscale EA serves as a homogenised implicit numerical constitutive law for the macroscale. The work focuses on the definition of the EA in a clay rock, in order to be both a realistic and simple representation of the material. Experimental observations and characterisations of the rock’s microstructure are considered to define the material in a realistic manner. Moreover, double-scale computation results highlight the claystone behaviour at micro and macro scales with comparison to experimental data of compression tests. An emphasis is put on the deformation processes at both scales.
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Pardoen, B., Bésuelle, P., Desrues, J., Dal Pont, S., & Cosenza, P. (2018). Considering the heterogeneity of argillaceous rock microstructure in a hydromechanical coupled double scale model. Microstructure de sols et des roches argileux – conséquences pour l’ingénieur (Journée Scientifique & Technique CFMS-CFMR), CNAM, Paris, France. https://hdl.handle.net/2078.5/54447