Multibody approach for reactive transport modeling in discontinuous-heterogeneous porous media

Adrien Socié (1, 2) , Frédéric Dubois (3, 2) , Yann Monerie (4, 2) , Frédéric Perales (1, 2)

1 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
2 MIST - Laboratoire de micromécanique et intégrité des structures
3 COMPEX - Expérimentation & Calcul Scientifique
4 MéTICE - Mécanique Théorique, Interface, Changements d’Echelles

In the context of long-term degradation of porous media, the coupling between fracture mechanics and reactive transport is investigated. A reactive transport model in a cracked discontinuous and heterogeneous porous medium is proposed. The species transport through and along the crack network are taken into account in a multibody approach. A dedicated geochemistry solver is developed and allows to take into account a significant number of chemical reactions. The model is validated via a benchmark for a porous medium without discontinuity. The applications deal with two kinds of chemical attacks in a pre-cracked concrete sample and highlight the impact of the discontinuities in the reactive transport kinetic and on the localization of the chemical degradation. The results bring out that a unidirectional descriptor, such as the depth of ingress rate, is not sufficient to describe the material degradation correctly.

Mots clés: Reactive transport; Cracked porous media; Geochemistry; Zero-thickness interface; Multibody approach

Domaines: Géophysique [physics.geo-ph]; Géologie appliquée

Adrien Socié, Frédéric Dubois, Yann Monerie, Frédéric Perales. Multibody approach for reactive transport modeling in discontinuous-heterogeneous porous media. Computational Geosciences, inPress, 25 (5), pp.1473-1491. ⟨10.1007/s10596-021-10058-x⟩. ⟨hal-03269431⟩