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Comparative modelling approaches of hydro-mechanical processes in sealing experiments at the Tournemire URL

Abstract

In this paper, a comparative modelling exercise from the DECOVALEX-2015 project is presented. The exercise is based on in situ experiments, performed at the Tournemire Underground Research Laboratory (URL), run by the IRSN (Institut de Radioprotection et de Sûreté Nucléaire), in France. These experiments aim at identifying conditions (e.g. technical specifications, design, construction, and defects) that will affect the long-term performance of swelling clay-based sealing systems, which is of key importance for the safety of underground nuclear waste disposal facilities. A number of materials are being considered as seals; the current work focusses on a 70/30 MX80 bentonite–sand mixture initially compacted at a dry density of 1.94 Mg/m3. The performance of the sealing plug involves at least three different important components, which are the hydro-mechanical behaviour of the bentonite–sand core, the overall permeability of the surrounding argillite, and the influence of the technological gap between the core and the argillite. Two particular tests have been selected for a comparative modelling exercise: the WT-1 test, which was designed to study the rock mass permeability, and the PT-A1 test, which aimed at quantifying the evolution of the hydro-mechanical field within the bentonite–sand core. A number of independent teams have worked towards modelling these experiments, using different codes and input parameters calibrated on additional small-scale laboratory experiments. Their results are compared and discussed.

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Acknowledgements

The work described in this paper was conducted within the context of the international DECOVALEX Project. The authors are grateful to the Funding Organisations who supported the work. The views expressed in the paper are, however, those of the authors and are not necessarily those of the Funding Organisations.

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Correspondence to A. Millard.

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This article is part of a Topical Collection in Environmental Earth Sciences on “DECOVALEX 2015”, guest edited by Jens T Birkholzer, Alexander E Bond, John A Hudson, Lanru Jing, Hua Shao and Olaf Kolditz.

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Millard, A., Mokni, N., Barnichon, J.D. et al. Comparative modelling approaches of hydro-mechanical processes in sealing experiments at the Tournemire URL. Environ Earth Sci 76, 78 (2017). https://doi.org/10.1007/s12665-016-6324-8

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  • DOI: https://doi.org/10.1007/s12665-016-6324-8

Keywords

  • Hydro-mechanical (HM) coupling
  • Numerical modelling
  • Sealing systems
  • Compacted bentonite–sand mixture