Analysis of key thermal coupled factors in modelling of bentonite barriers

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
Conference article in proceedings
This publication is imported from Aalto University research portal.
View publication in the Research portal
View/Open full text file from the Research portal
Date
2021-10-12
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
88-93
Series
Third International Symposium on Coupled Phenomena in Environmental Geotechnics, Volume 9
Abstract
Bentonite is a material considered to be used as a component of a barrier in deep geological repositories for nuclear waste. Its behaviour is affected by temperature, humidity and chemical composition of water saturating its pores. Reproduction of bentonite behaviour in such thermo-hydro-mechanical (THM) conditions involves extensive use of empirical and physical coupled relationships. This paper investigates parameters, which influence the bentonite behaviour in THM experiments relevant to the conditions in the repositories. For the study, a numerical investigation is performed based on test simulation computed with the finite element code Thebes (Abed and Sołowski 2017). A numerical simulation by Abed and Sołowski (2017) of a non-isothermal infiltration experiment (Villar and Gomez-Espina 2009) has been taken as a basis for the investigation. The results of this simulation were compared with a series of 7 other simulations that are set up by inactivating the selected thermally coupled variables, one at a time. Presented results identify the key parameters the simulation is sensitive to and provide insights on the relevance of the underlying coupled processes.
Description
Keywords
bentonite, nuclear repository, thermo-hydro-mechanical coupling, net mean stress
Other note
Citation
Gupta , A , Abed , A & Sołowski , W T 2021 , Analysis of key thermal coupled factors in modelling of bentonite barriers . in Third International Symposium on Coupled Phenomena in Environmental Geotechnics . vol. 9 , Japanese Geotechnical Society , pp. 88-93 , International Symposium on Coupled Phenomena in Environmental Geotechnics , Kyoto , Japan , 20/10/2021 . https://doi.org/10.3208/jgssp.v09.cpeg148