Objetivo
HTM (Hydro-Thermo-Mechanical) processes in jointed rock may be of importance in nuclear waste performance assessment.
So DECOVALEX is dealing with the study of coupled hydro-thermo-mechanical modelling processes in fracturated rock and associated computer codes.
A computer program has been designed to simulate the processes in a large rock mass with a repository located at depth of about 500 metres. The model is two dimensional, measures 3000 m x 1000 m and contains two sets of intersecting fractures. Three fracture spacings are defined or 25 m, 50 m, 100 m. A non-uniform hydraulic head acts at the ground surface and zero flux is imposed on the bottom and lateral boundaries. The heat flux from the repository is assumed to decay exponentially with time.
A second computer program has been written, consisting of a model of an assemblage of nine blocks, separated by two sets of discontinuities (planar fractures). This model measures 0.75 m x 0.50 m and is confined along all boundaries. The rock mass is subjected to in situ stress and thermal loading as well as hydraulic gradient. No flow and adiabatic conditions are imposed at top and bottom of the model. The heat flux acting along a section of one of the lateral boundaries includes expansion of the rock mass and cause shearing in the model.
To obtain the experimental data needed to quantify the effects of joint deformation and joint conductivity, a testing facility has been designed and built by the Norwegian Geotechnical Institute. With this apparatus, joints can be closed and sheared under controlled conditions while fluids can be flushed through the joint. Deformations, flow rates and stresses are recorded simultaneously. The boundary stresses applied by flat jacks result in pure normal stress when the same pressure is applied in the flat jack. An increasing shear stress occurs when differential pressure is applied. The proposed coupled stress flow models have input data derived from Stripa studies. The options of linear and nonlinear joint deformability are given and different loading conditions are specified.
Work programme:
Phase 1
(1) Bench-mark Test 1, called "Far field model"
This BMT is designed to simulate the processes in a large rock mass with a repository located at depth of about 500 meters. The model is two-dimensional, measures 3000 m x 1000 m and contains two sets of intersecting fractures. Three fracture spacings are defined 25 m, 50 m, 100 m. A non-uniform hydraulic head acts at the ground surface and zero flux is imposed on the bottom and lateral boundaries. The heat flux from the repository is assumed to decay exponentially with time.
(2) Bench-mark Test 2, called "Multiple fracture model"
This BMT consist of an assemblage of nine blocks, separated by two sets of discontinuities (planar fractures). This model measures 0.75 m x 0.50 m and is confined along all boundaries. The rock mass is subjected to in-situ stress and thermal loading as well as hydraulic gradient. No-flow and adiabatic conditions are imposed at top and bottom of the model. The heat flux acting along a section of one of the lateral boundaries will include expansion of the rock mass and cause shearing in the model.
(3) Test Case 1, called "Coupled Stress-Flow model"
To obtain the experimental data needed to quantify the effects of joint deformation and joint conductivity, a testing facility has been designed and built. With this apparatus, joints can be closed and sheared under controlled conditions while fluids can be flushed through the joint. Deformations, flow rates and stresses are recorded simultaneously. The boundary stresses applied by flat jacks result in pure normal stress when the same pressure is applied in the flat jack. An increasing shear stress occurs when differential pressure is applied. The proposed coupled stress-flow model have input data derived from Stripa studies. The options of linear and non-linear joint deformability are given and different loading conditions are specified.
Ámbito científico (EuroSciVoc)
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
- ingeniería y tecnología otras ingenierías y tecnologías ingeniería nuclear gestión de residuos nucleares
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Las convocatorias de propuestas se dividen en temas. Un tema define una materia o área específica para la que los solicitantes pueden presentar propuestas. La descripción de un tema comprende su alcance específico y la repercusión prevista del proyecto financiado.
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Procedimiento para invitar a los solicitantes a presentar propuestas de proyectos con el objetivo de obtener financiación de la UE.
Régimen de financiación
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Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.
Coordinador
92298 CHATENAY MALABRY
Francia
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