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Results
ABSTRACT ABSTRACT: The argilites from Meuse/Haute-Marne is a material studied by ANDRA, as a potential host rock for radioactive waste disposal. Numerous tests were performed in order to determine the thermo-hydro- mechanical behaviour of this rock. First, physical properties like density, porosity, water content, permeability and mineralogy were determined on all the stratum on core samples (research laboratories) and in boreholes (in-situ). Some uniaxial and triaxial compression tests were performed on samples coming from different depths. Mechanical behaviour is determined as elasto-visco-plastic with an induced anisotropic damage. The material appears stiffer when calcite content increases, and when clay or water content decreases. Biot's coefficient decreases when axial stress increases and the material is able to swell. These phenomena can be explained at the microlevel. Finally, some creep tests were performed under temperature from 20 to 120°C. Viscoplastic strains appear to be very low under hydrostatic stress but increase with deviatoric stress and temperature.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Mineral > Silicate > Phyllosilicate (0.52)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.51)
- Water & Waste Management > Solid Waste Management (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Energy > Power Industry > Utilities > Nuclear (0.49)
- Health, Safety, Environment & Sustainability > Environment > Waste management (0.69)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (0.56)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (0.51)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.51)
ABSTRACT ABSTRACT: This paper describes the geomechanical development plan established to provide data for safety assessment and conceptual models of an argillite formation studied by ANDRA in the framework of feasibility study of underground waste disposal in France. Geomechanical conceptual model of a disposal in that formation is divided into three models: the conceptual model of host formation describing the overall generic mechanical behavior; the geotechnical conceptual model for construction and design; the conceptual model of the repository describing the layer from the safety and retrievability standpoint. The content of each model is presented and analysed. In order to verify the pertinence of these models, in situ geomechanical experiments are envisaged in the Underground Research Laboratory to be constructed in the argilites formation. The strategy of numerical modeling program associated to the in situ geomechanical experiments is described.
- Europe > France > Grand Est > Haute-Marne (0.40)
- Europe > Norway > Norwegian Sea (0.24)
- Water & Waste Management > Solid Waste Management (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Energy > Power Industry > Utilities > Nuclear (0.41)