Abstract
A new approach is investigated for the modelling of the hydro-mechanical behaviour of Callovo-Oxfordian claystone, a potential host rock for radioactive waste repositories in France. This approach is a double-scale finite element method with a micro and a macro scale. At the micro level a representative elementary volume (REV) is used to model the material behaviour. The global response of this REV serves as an implicit constitutive law for the macro scale. On the macro scale, a poro-mechanical continuum is defined with fully coupled hydro-mechanical behaviour; the microscale contains a model that takes into account the material micro structure and fluid/solid interaction to provide the material responses and associated stiffness matrices. Computational homogenization is used to retrieve these stiffness matrices from the micro level. This double scale approach is applied in the simulation of a biaxial deformation test and the response at the macro level is related to the micro-mechanical behaviour.
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Acknowledgments
The support from the French national radioactive waste management agency (Andra) is gratefully acknowledged.
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van den Eijnden, B., Collin, F., Bésuelle, P., Chambon, R. (2015). A FE2 Model for Hydro-mechanical Coupling. In: Chau, KT., Zhao, J. (eds) Bifurcation and Degradation of Geomaterials in the New Millennium. IWBDG 2014. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-13506-9_9
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DOI: https://doi.org/10.1007/978-3-319-13506-9_9
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