Hydro-elasto-viscoplastic modeling of a drift at the Meuse/Haute-Marne underground research laboratoratory (URL) |
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| Institution: | 1. INERIS, c/o Ecole des Mines de Nancy, Campus ARTEM, CS 14234, F-54042 Nancy, France;2. Andra R&D, Meuse/Haute-Marne Underground Research Laboratory, 55290 Bure, France;3. INERIS, BP 2, 60550 Verneuil-en-Halatte, France;1. Department of Mechanical Engineering and Industrial Systems, Tampere University of Technology, P.O. Box 589, FIN-33101 Tampere, Finland;2. Ecole Normale Supérieure de Cachan, LMT, 61 avenue du president Wilson, 94235 Cachan, France;1. ArGEnCo Department, University of Liège, Allée de la Découverte 9, 4000 Liège, Belgium;2. Fluid and Solid Mechanics Department, Research and Development Division, Andra, Rue Jean Monnet 1-7, 92298 Châtenay-Malabry, France;1. Andra, 1-7 rue Jean Monnet, 92298 Châtenay-Malabry, France;2. Univ. Grenoble Alpes, 3SR, 38000 Grenoble, France;3. CNRS, 3SR, 38000 Grenoble, France;4. ArGEnCo Dept, Univ. of Liège, 4000 Liège, Belgium;1. College of Civil and Architecture Engineering, Hubei University of Technology, Wuhan, China;2. Laboratory of Mechanics of Lille, UMR CNRS 8107, University of Lille, 59655, Villeneuve d''Ascq, France |
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| Abstract: | An underground research laboratory (URL) is being constructed by Andra in eastern France, in Callovo-Oxfordian claystone (COx) in which various in situ geomechanical experiments are being undertaken or are to be carried out. The aim of this URL is to characterize the in situ properties of COx claystone and to test disposal technologies in a realistic way in order to assess the short- and long-term safety of a deep radioactive waste repository. In parallel, theoretical and numerical models able to reproduce the phenomena observed under different types of loading paths must be developed.The phenomenological elastic-visco-plastic model developed by Souley et al. (2011) has been enhanced to reflect recent advances in understanding of the mechanical and hydromechanical behavior of COx claystone and the modification of the mechanical and hydraulic properties in the EDZ (Excavation Damage Zone). In particular, the influence of induced damage and fracturing on the delayed strains and strain rates of the COx claystone and the permeability changes observed at the site scale, as well as hydro-mechanical couplings, are discussed and incorporated in a new model. This model is implemented into the commercial code FLAC3D. Short- and long-term test data (Armand et al., 2016) can be used to identify possible key parameters for the model. These tests were also used to identify certain parameters of our model. Some tests were simulated to verify the numerical implementation of the proposed model.Finally, the simulation of the GCS drift excavation (Seyedi et al., 2016) has been performed. Comparisons to in situ measurements are discussed and some accordance and discrepancies were observed. |
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| Keywords: | Hydromechanical and viscoplastic behavior Numerical implementation Numerical modeling In situ measurements |
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