Multi-scale approach; Finite Element Method; Gas transport processes; Preferential pathways; Two-phase flow; Clay material; Nuclear waste disposal
Abstract :
[en] Deep geological disposal is the preferred solution in many countries to manage radioactive wastes, such as in Belgium where the Boom Clay is the candidate host rock. Over the long term, corrosion mechanisms are expected to release large amounts of gas that will rise in pressure and activate different gas transport processes in the system and the surrounding geological formation. Assessing which transfer mode prevails under which range of pressure conditions in the sound rock layers remains a major issue. This paper presents a multi-scale hydro-mechanical model capturing the influence of the microstructure features on the macroscopic gas flow, and especially the emergence of preferential gas-filled pathways. A detailed constitutive model for partially saturated clay materials is developed from experimental data to perform the modelling of a Representative Element Volume, and integrated into a multi-scale scheme using homogenisation and localisation techniques for the transitions to the macroscopic scale. Using this tool, numerical modelling of a gas injection tests in the Boom Clay are performed with the aim of improving the mechanistic understanding of gas transport processes in natural clay barriers.
Disciplines :
Civil engineering
Author, co-author :
Corman, Gilles ; Université de Liège - ULiège > Urban and Environmental Engineering
Gonzalez-Blanco, Laura; Universitat Politècnica de Catalunya · Barcelona Tech - UPC > International Centre for Numerical Methods in Engineering (CIMNE) > Geomechanics Group
Levasseur, Séverine; ONDRAF/NIRAS
Collin, Frédéric ; Université de Liège - ULiège > Département ArGEnCo
Language :
English
Title :
Hydro-mechanical modelling of gas transport processes in clay materials using a multi-scale approach
Alternative titles :
[fr] Modélisation hydro-mécanique des mécanismes de transport de gaz dans les matériaux argileux à l'aide d'une approche multi-échelles
Publication date :
2024
Journal title :
Computers and Geotechnics
ISSN :
0266-352X
eISSN :
1873-7633
Publisher :
Elsevier, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 847593 - EURAD - European Joint Programme on Radioactive Waste Management
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