Reference : Hydro-mechanical study of MAVL nuclear waste repository galleries in Callovo-Oxfordia...
Scientific congresses and symposiums : Unpublished conference/Abstract
Engineering, computing & technology : Materials science & engineering
Hydro-mechanical study of MAVL nuclear waste repository galleries in Callovo-Oxfordian claystone
Argilaga, Albert mailto [Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur >]
Charlier, Robert [Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur >]
Cerfontaine, Benjamin [Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur >]
Vu, Minh-Ngoc []
Collin, Frédéric [Université de Liège - ULiège > Département ArGEnCo > Géotechnique >]
Collin F, Chambon R, Charlier R (2006) A finite element method for poro mechanical modelling of geotechnical problems using local second gradient models. Int J Numer Meth Eng 65(11):1749–1772

OECD/NEA (1995). The environmental and ethical basis of geological disposal of longlived radioactive wastes. A collective opinion of the Radioactive Waste Management Committee of the OECD Nuclear Energy Agency. Technical report, OECD – Nuclear Energy Agency.

Pardoen B, Talandier J, Collin F (2016), Permeability evolution and water transfer in the excavation damaged zone of a ventilated gallery, International Journal of Rock Mechanics and Mining Sciences 85, 192-208

Pietruszczak S, Lydzba D, Shao JF (2002) Modelling of inherent anisotropy in sedimentary rocks. Int J Solids Struct 39:637–648
Second International Workshop on the Finite Element Code LAGAMINE (LAGASHOP 2018)
31 January – 2 February 2018
Delft University of Technology
The Netherlands
[en] Hydro-mechanical ; MAVL ; nuclear waste ; repository galleries ; Callovo-Oxfordian ; claystone
[en] The disposal of radioactive waste in deep underground repositories has been studied for a long while (OECD/NEA, 1995). Argillaceous rocks have been found to be good candidates to host the repositories because of their low permeability and the ability to absorb radionuclides. In France, the Callovo-Oxfordian argillite (COX) has been chosen by the national agency ANDRA to be the host rock to store the radioactive waste.

During the previous years, the problem of gallery excavations in the COX host rock has been the case of study in Liège University. The problem, involving strain localization, is not well posed when modelled using classical theories; a microstructured model is proposed: local Second Gradient (Collin et al. 2006), this avoids the pathological mesh dependency by introducing an internal length that regularizes the problem.

At the present time, the model takes into account several transverse anisotropies, e.g. cohesion (Pietruszczak et al. 2002), a visco-plastic model is retained to model the long term convergence, finally, a permeability evolution model allows to correlate strain localization and permeability increase (Pardoen et al. 2016).

The purpose of this work is to model the long term behaviour of the MAVL galleries (100 years) with a special focus on the localisation extent, effect of ventilation, displacements and concrete stress state. Results (Figure 1) show an important effect of the supporting structure on the problem, the compressible wedges determine the localization mode by triggering the shear bands. Results also show a high sensitivity to the viscosity parameters.

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