Journal
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
Volume 140, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2020.104574
Keywords
Thermo-Hydro-Mechanical behavior; Callovo-Oxfordian claystone; Numerical modelling; Radioactive waste management
Funding
- Andra
- BGR/UFZ
- CNSC
- US DOE
- ENSI
- JAEA
- IRSN
- KAERI
- NWMO
- RWM
- SURAO
- SSM
- Taipower
- Spent Fuel
- Waste Science and Technology, Office of Nuclear Energy, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Lawrence Berkeley National Laboratory
- Radioactive Waste Management Ltd.
- Federal Institute for Geosciences and Natural Resources [20410088620]
- Federal Ministry for Education and Research (BMBF)
- Helmholtz Association [02NUK053E, SO-093]
Ask authors/readers for more resources
This paper focuses on the THM responses of low permeability porous rock under thermal loading in the context of deep geological disposal of radioactive waste. Numerical simulations of a hypothetical HLW repository were conducted by five modelling teams, who adopted different approaches and assessed the impact of modelling simplifications and assumptions on the HLW repository assessment.
This paper is devoted to the study of the Thermo-Hydro-Mechanical (THM) responses of a porous rock with low permeability under thermal loading in the context of deep geological disposal of radioactive waste. To this aim, numerical simulations of a benchmark exercise of a hypothetical high-level radioactive waste (HLW) repository were performed. This benchmark exercise considered as a host formation the Callovo-Oxfordian claystone (COx), which has been selected for a deep geological disposal in France. Within the framework of the DECOVALEX-2019 project, five modelling teams (Andra, LBNL, NWMO, Quintessa, UFZ/BGR) adopted a thermo-poro-elastic approach and proposed different 3D representations of the HLW repository. The differences between the teams consisted mostly in the simplification of the geometrical model and the interpretation of the boundary conditions. Numerical results for temperature, pore pressure, and effective stress evolution in the far field (i.e., at the mid-distance of two HLW cells) were compared between the teams, to quantify the impact of modelling simplifications/assumptions for the assessment of the HLW repository. The THM behaviour of the COx formation in the near field (i.e., excavation damaged zone around the HLW cells) is not the objective of this study. Moreover, plane strain conditions were considered and evaluated in comparison to 3D modelling. Key parameters influencing the THM responses of the HLW repository were assessed by both mono- and multi-parametric analyses. Spatial variability analyses of THM parameters were also carried out to study the influence of the spatial correlation length on the Terzaghi effective stress and to estimate its probability distribution. The conclusions of this study provide reliable numerical techniques for modelling large-scale deep geological disposals and deduce the main behavior of the HLW repository.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available