Gas migrations; H2M couplings; Nuclear waste disposal; Numerical modelling; Second gradient model; Strain localisation; Claystones; Excavation damaged zones; Flow properties; Gas migration; Gradient modelling; H2M coupling; Numerical investigations; Strain localizations; Modeling and Simulation; Materials Science (all); Condensed Matter Physics; Mechanics of Materials; Mechanical Engineering; Applied Mathematics; General Materials Science
Abstract :
[en] Deep geological repository is the preferred solution in many countries to manage radioactive wastes, such as in France where the Callovo-Oxfordian (COx) claystone is the candidate host rock. In such clay rock formation, the drilling of storage gallery creates an Excavation Damaged Zone (EDZ) with altered flow properties in the short term, while corrosion processes release large amounts of gas in the long term. Assessing the evolution of gas pressures in the near-field and predicting the effect of the EDZ on gas transport remains a major issue. This paper presents a second gradient two-phase flow hydro-mechanical (H2M) model tackling the multi-physics couplings related to gas transfers and fractures development. The EDZ is reproduced by shear strain localisation bands using a microstructure enriched model with a second gradient approach. The gas migration is captured by a biphasic fluid transfer model. The impact of fracturing on the flow properties is addressed by relating the permeability and the water retention curve to mechanical strains. Using this tool, numerical modelling of a drift in the COx claystone is performed with the aim of emphasising the influence of the HM couplings on gas migrations at nuclear waste disposal scale.
Disciplines :
Civil engineering
Author, co-author :
Corman, Gilles ; Université de Liège - ULiège > Urban and Environmental Engineering
Vu, Minh-Ngoc; Andra, Châtenay-Malabry, France
Collin, Frédéric ; Université de Liège - ULiège > Département ArGEnCo
Language :
English
Title :
Numerical investigation of the couplings between strain localisation processes and gas migrations in clay materials
Alternative titles :
[fr] Etude numérique des couplages entre la localisation des déformations et les migrations de gas dans les matériaux argileux
H2020 - 847593 - EURAD - European Joint Programme on Radioactive Waste Management
Funders :
EU - European Union
Funding text :
The authors are grateful for financial supports from EURAD , the European Joint Programme on Radioactive Waste Management (under grant agreement No 847593 ), and from ANDRA, the French national radioactive waste management agency .
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