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Dissolution du gypse : analyse et modélisations

Abstract : In this research, we are interested in the issue of dissolution of soluble rocks, and their geomechanical consequences like continuous and discontinuous subsidence and sinkholes. This research focuses on gypsum rocks, although the developed method is also adapted to salt rocks. A large-scale Diffuse Interface Model (DIM) is used to describe the evolution of a gypsum cavity induced by dissolution. The method is based upon the assumption of a pseudo-component dissolving with a thermodynamic equilibrium boundary condition. A methodology is proposed based on numerical computations with fixed boundaries to choose suitable parameters for the DIM model and hence predict the correct dissolution fluxes and surface recession velocity. Additional simulations were performed to check which type of momentum balance equation should be used. The potential of the methodology is illustrated on two large-scale configurations: one corresponding to a gypsum lens within a porous rock layer and the other to a pillar in a flooded gypsum mine. A final case is a comparison between salt and gypsum dissolution rate.
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Submitted on : Thursday, September 6, 2018 - 3:51:09 PM
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  • HAL Id : ineris-01869662, version 1



Farid Laouafa, Xavier Daupley. Dissolution du gypse : analyse et modélisations. Rapport Scientifique INERIS, 2017, 2016-2017, pp.36-37. ⟨ineris-01869662⟩



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