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Numerical modeling of self-sealing in fractured clayey materials

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Abstract

The fractures network generated during the excavation of underground research facilities can induce stress redistribution and alteration of flow and transport properties, becoming preferential paths for releasing radionuclides into the host rock. Nevertheless, in the long term, the fracture can be sealed through the resaturation of water coming from the rock as a function of its self-sealing potential. Despite the large number of experimental studies that have proven the self-sealing capacity of clay rocks, very few attempts have been made to describe and predict the phenomenon numerically. This may be due to the difficulty of measuring the initial hydro-mechanical conditions. Besides, samples artificially fractured in the laboratory can be disturbed by the preparation process itself, which can alter the hydro-mechanical state. This paper addresses that issue by bridging the gap between experiments and numerical modeling. Representative experimental tests performed on Callovo–Oxfordian Claystone (COx) are used to offer a hydro-mechanical fracture law taking into account the self-sealing capacity of the material. Implementing such a model in a finite element code allows its validation through comparison with laboratory tests. Furthermore, the role of the initial fracture size and the evolution of water permeability during the wetting/drying process is investigated. Due to its transmissivity, injected water can penetrate the rock, initially reaching the damaged zone around the fracture before spreading through the entire sample. This progression is accounted in the constitutive equation and represented numerically. Nevertheless, a larger initial crack leads to reduced recovery rates. These results match the experiments, offering a valuable perspective in the modeling of self-sealing in in situ conditions.

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Acknowledgements

This research was supported by the University of Liège under Special Funds for Research, IPD-STEMA Program. This work was also carried out in the framework of the EURAD, European Joint Program on Radioactive Waste Management (under Grant agreement No 847593), to which the authors are grateful.

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Authors and Affiliations

  1. Urban and Environmental Engineering Research Unit, University of Liège, 4000, Liège, Belgium

    Adriana Quacquarelli & Frédéric Collin

  2. R&D Division, Andra, 92298, Chatenay-Malabry, France

    Jean Talandier

  3. Univ. Grenoble Alpes, CNRS, Grenoble INP, 3SR, 38000, Grenoble, France

    Alice Di Donna

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  1. Adriana Quacquarelli
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Correspondence to Adriana Quacquarelli.

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Quacquarelli, A., Talandier, J., Di Donna, A. et al. Numerical modeling of self-sealing in fractured clayey materials. Acta Geotech. (2024). https://doi.org/10.1007/s11440-024-02299-8

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