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Abstract

At the Meuse-Haute-Marne underground rock laboratory, France, a mine-by experiment was performed in the niche GCS by ANDRA. A 3D coupled hydraulic and mechanical (HM) continuum model was applied to understand the coupled HM mechanisms in the Callovo–Oxfordian claystone. Features such as transverse isotropy, shrinkage phenomena and permeability change induced by mechanical deformation were considered using the numerical code RockFlow. Intensive parameter studies in comparison with measured deformation and pore pressure data reduced model uncertainties. Fully saturated models showed very precise calculation results for the far-field zone sensors, but rapidly decreased pore pressure and continuously increased deformation in the near-field zone cannot be interpreted adequately even considering shrinkage and partially saturated flow models. A 2D isotropic damage model taking stiffness degradation into account was applied and acceptable calculation results were obtained for pore pressure evolution. However, the time-dependent deformation cannot be evaluated by the current model.

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