Hydro-mechanical modelling of gas transport processes in clay materials using a multi-scale approach

Corman, Gilles; Gonzalez-Blanco, Laura; Levasseur, Séverine; Collin, Frédéric

doi:10.1016/j.compgeo.2024.106503

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Hydro-mechanical modelling of gas transport processes in clay materials using a multi-scale approach

Corman, Gilles; Gonzalez-Blanco, Laura; Levasseur, Séverine et al.

2024 • In Computers and Geotechnics

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https://hdl.handle.net/2268/317437

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10.1016/j.compgeo.2024.106503

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Keywords :

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

Funders :

EU - European Union

Available on ORBi :

since 06 May 2024

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