Identification of key thermal couplings affecting the bentonite behaviour in a deep geological nuclear waste repository

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorGupta, Abhisheken_US
dc.contributor.authorAbed, Ayman A.en_US
dc.contributor.authorSolowski, Wojciech T.en_US
dc.contributor.departmentDepartment of Civil Engineeringen
dc.contributor.groupauthorMineral Based Materials and Mechanicsen
dc.date.accessioned2023-08-30T04:19:54Z
dc.date.available2023-08-30T04:19:54Z
dc.date.issued2023-10en_US
dc.descriptionFunding Information: The authors would like to gratefully acknowledge that the presented research has been funded by EURAD – European joint programme on radioactive waste management (Gas subproject) and Dean scholarship Aalto University. EURAD has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement n°847593. Funding Information: The authors would like to gratefully acknowledge that the presented research has been funded by EURAD – European joint programme on radioactive waste management (Gas subproject) and Dean scholarship Aalto University. EURAD has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement n°847593 . Publisher Copyright: © 2023
dc.description.abstractDeep geological nuclear waste repositories use the multi-layer Engineered Barrier System (EBS) to isolate nuclear waste from the environment. The key component of the barrier is densely compacted bentonite, closely resembling claystone. Therefore, to ensure safety, we need a numerical model for the bentonite and the barrier that predicts EBS behaviour during transient thermal, hydraulic, mechanical and chemical conditions. The paper identifies key mechanisms and processes affecting the bentonite in the barrier due to temperature changes (thermal couplings) based on advanced fully-coupled Finite Element Method simulations. The paper investigates 1) non-isothermal infiltration experiment on FEBEX bentonite (Villar and Gomez-Espina, 2009) and, 2) Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (Ciemat) test (Martin et al., 2006), presenting 10 simulation configurations that are set up by inactivating one thermal coupling/variable at a time. The difference between these simulations and the baseline model results, examined in terms of the net mean stress (swelling pressure), suction and fluid flow, give insights into the significance of investigated coupling. Results suggest that thermal couplings related to vapour density, viscosity, water retention curve, and molecular diffusivity are among the most influential. The study additionally highlights the importance of water transport as liquid and gas, and water evaporation and condensation.en
dc.description.versionPeer revieweden
dc.format.extent22
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationGupta, A, Abed, A A & Solowski, W T 2023, ' Identification of key thermal couplings affecting the bentonite behaviour in a deep geological nuclear waste repository ', Engineering Geology, vol. 324, 107251 . https://doi.org/10.1016/j.enggeo.2023.107251en
dc.identifier.doi10.1016/j.enggeo.2023.107251en_US
dc.identifier.issn0013-7952
dc.identifier.issn1872-6917
dc.identifier.otherPURE UUID: 2128c7be-d93f-4240-ba00-e93bdd57e65aen_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/2128c7be-d93f-4240-ba00-e93bdd57e65aen_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85167838984&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/119651328/1_s2.0_S0013795223002697_main.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/122961
dc.identifier.urnURN:NBN:fi:aalto-202308305301
dc.language.isoenen
dc.publisherElsevier Science B.V.
dc.relation.ispartofseriesEngineering Geologyen
dc.relation.ispartofseriesVolume 324en
dc.rightsopenAccessen
dc.subject.keywordBentoniteen_US
dc.subject.keywordClaystoneen_US
dc.subject.keywordNuclear waste repositoryen_US
dc.subject.keywordNumerical modellingen_US
dc.subject.keywordSensitivityen_US
dc.subject.keywordSuctionen_US
dc.subject.keywordSwelling pressureen_US
dc.subject.keywordThermal couplingen_US
dc.subject.keywordThermo-hydro-mechanical couplingen_US
dc.titleIdentification of key thermal couplings affecting the bentonite behaviour in a deep geological nuclear waste repositoryen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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