Underground rock dissolution and geomechanical issues

Farid Laouafa (1) , Jianwei Guo (2) , Michel Quintard (3)

1 INERIS - Institut National de l'Environnement Industriel et des Risques
2 SWJTU - Southwest Jiaotong University
3 IMFT - Institut de mécanique des fluides de Toulouse

This paper deals with the problem of the dissolution of soluble underground rocks and the geomechanical consequences such as subsidence, sinkholes and underground collapse. In this paper, the rock dissolution and the induced underground cavities aremodeled using a Diffuse Interface Model. We describe briefly the method. We used to perform the transition (upscaling) from a multiphysics problem formulated at the microscopic scale level (pore-scale) to the macroscopic scale level (Darcy-scale). Rock material considered in this paper is gypsum, despite that the developed method is also suitable for more soluble rocks. The mechanical consequences of dissolution are analyzed fortwo theoretical configurations, i.e., lens and pillar

Mots clés: Porous media; Dissolution; Geomechanics

Domaines: Mécanique des fluides [physics.class-ph]

Farid Laouafa, Jianwei Guo, Michel Quintard. Underground rock dissolution and geomechanical issues. 53rd US Rock Mechanics / Geomechanics Symposium ARMA 19, Jun 2019, New York City, United States. pp.1-12. ⟨hal-02290041⟩