Creep Effects on the Thermo-Hydro-Mechanical Responses of Callovo-Oxfordian Claystone
| Autor: | Carlos Plúa, M. Alonso, Antonio Gens, Minh-Ngoc Vu, M. Souley, C. De Lesquen, Gilles Armand, Jean Vaunat |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Doctorat en Enginyeria del Terreny, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
| Rok vydání: | 2021 |
| Předmět: |
Energies::Energia nuclear [Àrees temàtiques de la UPC]
Materials science COx Drilling Radioactive waste Creep effect Thermal load Thermal expansion Pore water pressure THM coupling Creep Nuclear waste repository Low permeability Geotechnical engineering Radioactive waste sites Enginyeria civil::Geotècnia::Mecànica de sòls [Àrees temàtiques de la UPC] Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus [Àrees temàtiques de la UPC] Abocadors de residus radioactius Porosity |
| Zdroj: | Challenges and Innovations in Geomechanics ISBN: 9783030645137 UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | In France, a deep geological disposal for high-level radioactive waste (HLW) and intermediate level long life radioactive waste (IL-LLW) called Cigéo is planned to be constructed in a deep Callovo-Oxfordian claystone (COx) formation, if it is authorized. The heat emitted from the waste leads to a temperature increase in the low permeability host porous formation, which induces a pore pressure increase essentially due to the difference between the thermal expansion of the pore water and the solid skeleton. This study aims at assessing the effect of nonlinear behavior of COx, especially creep, on the THM response of the HLW repository. Different approaches, from perfectly MohrCoulomb model and simplified time-dependent models (power and Norton) to an advanced model, have been considered. These approaches lead to common conclusions that (1) the creep reduces the pore pressure increase compared to poro-elastic approach; (2) the nonlinear instantaneous response in the near-field resulting from cell drilling does not affect the THM response in the far field and (3) the thermal load does not induce any supplementary damage of the host rock |
| Databáze: | OpenAIRE |
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