Investigation on the anisotropic mechanical behaviour of the Callovo-Oxfordian clay rock : within the framework of ANDRA/GRS cooperation programme : final report / Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH ; Chun-Liang Zhang (GRS), Gilles Armand (ANDRA), NathalieConil (ANDRA) ; this report was prepared under contract No. 059844 with the French Agence Nationale pour la Gestion de Déchets Radioactifs (ANDRA).