Journal
COMPUTERS AND GEOTECHNICS
Volume 85, Issue -, Pages 277-286Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2016.06.003
Keywords
Callovo-Oxfordian claystone; Microstructure; Triaxial compression and creep tests; Time-dependent behaviour
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Within the framework of feasibility studies for a reversible, deep geological repository of high-and intermediate-level long-lived radioactive waste (HLW, IL-LLW), the French National Radioactive Waste Management Agency (Andra) is investigating the Callovo-Oxfordian (COx) claystone formation near Bure (northeast France) as a potential host formation for the repository. In 2000, Andra initiated construction of the Meuse Haute-Marne Underground Research Laboratory (MHM URL). Concurrently with on-site construction work, an extensive research program has been conducted, including theoretical and experimental studies and constitutive modelling. In-situ experiments provide an extensive data set for performance evaluation of models describing the thermo-hydro-mechanical behaviour of COx claystone under different conditions (excavation, heat, etc.). In 2012, a benchmark exercise was initiated to evaluate proposed models, including basic assumptions, mathematical descriptions, input variables and parameters, and to determine how these assumptions influence model outcomes with respect to in-situ experimental observations. The present paper outlines the main features of the hydromechanical behaviour of COx claystone and presents a series of laboratory test results (triaxial compression and creep tests) providing model development teams with a coherent database for model calibration and validation. (C) 2016 Published by Elsevier Ltd.
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