Print Email Facebook Twitter Heterogeneous Swelling of an Isotropically Compacted Bentonite-Based Material Title Heterogeneous Swelling of an Isotropically Compacted Bentonite-Based Material: Experimental Observations and Modelling Author Dieudonné, A.A.M. (TU Delft Geo-engineering) Gatabin, Claude (Université Paris-Saclay, Paris) Dridi, Wissem (Université Paris-Saclay, Paris) Talandier, Jean (Agence nationale pour la gestion des déchets radioactifs) Collin, Frédéric (Université de Liège) Charlier, Robert (Université de Liège) Date 2023 Abstract This paper presents a comprehensive investigation of the swelling behaviour of a compacted bentonite–sand mixture subjected to hydration under constant volume conditions. Contrary to previous studies, the tested sample was isotropically compacted before being hydrated under constant volume conditions until full saturation was reached. The total axial pressure, total radial pressures at four different heights of the sample, and injected water volume were recorded over time. The experimental data reveal a complex and non-uniform evolution of the axial and radial stresses over time, as well as anisotropy of the total stresses, which persist at the saturated equilibrated state. To gain further insights, a numerical analysis was performed using an advanced hydromechanical framework for partially saturated porous media, accounting for the evolving microstructure of the material. The complex evolution of the total axial and radial pressures with time is attributed to the advancing hydration and swelling front in the sample, along with the development of irreversible strains. The good agreement between the numerical results and the experimental data enables validation of the developed framework. Implications for engineered barriers in deep geological disposal of radioactive waste are discussed. Subject Compacted bentoniteHydro-mechanical modellingInfiltration testStress-path dependency To reference this document use: http://resolver.tudelft.nl/uuid:b8cd4233-94d4-47dc-9414-3ec6873749b1 DOI https://doi.org/10.1007/s00603-023-03476-z ISSN 0723-2632 Source Rock Mechanics and Rock Engineering Part of collection Institutional Repository Document type journal article Rights © 2023 A.A.M. Dieudonné, Claude Gatabin, Wissem Dridi, Jean Talandier, Frédéric Collin, Robert Charlier Files PDF s00603_023_03476_z.pdf 1.65 MB Close viewer /islandora/object/uuid:b8cd4233-94d4-47dc-9414-3ec6873749b1/datastream/OBJ/view