Effect of mechanical non-linearities on the thermal-hydraulic-mechanical response of a geological repository - Ineris - Institut national de l'environnement industriel et des risques Access content directly
Conference Papers Year : 2022

Effect of mechanical non-linearities on the thermal-hydraulic-mechanical response of a geological repository

M-N. Vu
  • Function : Author
C. de Lesquen
  • Function : Author
G. Armand
  • Function : Author

Abstract

In France, the National Radioactive Waste Management Agency (Andra) oversees the study of a disposal for intermediate-level long-lived (IL-LLW) and high-level activity radioactive waste (HLW) in a deep claystone formation (Callovo-Oxfordian claystone, COx) in the framework of Cigéo project. Several in situ and laboratory THM characterization studies have been undertaken in this formation since 2000. In parallel, theoretical analyses, constitutive models and numerical modelings have been developed to describe different processes during the life of the disposal. This paper presents a regularized anisotropic elastoplastic and damage model including both non-linear short and long terms response. The influence of damage and fracturation on the transport and viscous properties are considered. The proposed model was implemented with a regularization scheme based on the non-local implicit gradient in Comsol Multiphysics®. After validating the model on simple stress paths, its operational nature is successfully evidenced on the GCS drift for which the in situ observations are the most challenging to reproduce. It is shown that the model is able of reproducing the measured pore pressure as well as the drift convergences. Importantly, the predicted extent of damaged zones around the drift is consistent with the in situ observations. Secondly, the proposed model is applied to study the THM behavior of a HLW repository. The role of the non-linear behavior of the COx claystone on the THM responses in the near and far fields, is herein highlighted in the framework of a benchmarking exercise within the European program EURAD HITEC.

Domains

Earth Sciences
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Dates and versions

ineris-03987904 , version 1 (20-04-2023)

Identifiers

  • HAL Id : ineris-03987904 , version 1

Cite

Mountaka Souley, M-N. Vu, C. de Lesquen, G. Armand. Effect of mechanical non-linearities on the thermal-hydraulic-mechanical response of a geological repository. 3. International Conference on Coupled Processes in Fractured Geological Media: Observation, Modeling, and Application (CouFrac 2022), Nov 2022, Berkeley, United States. pp.CouFrac2022-99. ⟨ineris-03987904⟩

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