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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 45 | Copyright
Adv. Geosci., 45, 25-33, 2018
https://doi.org/10.5194/adgeo-45-25-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Jul 2018

24 Jul 2018

Micromechanical modeling of the Compression of the Damaged Zone experiment in the Callovo-Oxfordian formation

Joffrey Bluthé1,2, Benoît Bary1, and Eric Lemarchand2 Joffrey Bluthé et al.
  • 1Den-Service d’Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
  • 2Laboratoire NAVIER, Ecole des Ponts ParisTech, 6/8 avenue Blaise Pascal, CHAMPS SUR MARNE, 77455 MARNE LA VALLEE CEDEX 2, France

Abstract. A theoretical model of the Compression of the Damaged Zone experiment is proposed. The tools of micromechanics are used to represent the fractured zone. Assuming an elastic behavior of the sound COx claystone and a simplified geometry of the drift, an analytical solution is presented and the crack closure is determined as a function of distance from the drift wall for two loading cases: a prescribed 4MPa pressure and a stress-free strain with 1% average value to describe the swelling due to resaturation. The results are in agreement with experimental observations and give insights into the heterogeneous character of self-sealing in the damaged zone.

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A theoretical model of the Compression of the Damaged Zone experiment performed is proposed. One of the key features of the present model is its ability to yield the crack closure. The mechanical and hydric effects are examined seperately: in one case a prescribed pressure is applied at the drift wall, and swelling strains in the cracked zone are introduced in the other to model its resaturation. The intensity of the crack closure is heterogeneous in both cases but is greater in the latter.
A theoretical model of the Compression of the Damaged Zone experiment performed is proposed. One...
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