Material Parameters and Experiments - Rock-mechanical Back-analysis of Long-term Deformation Behaviour of Drifts in Claystone Formations using Advanced Constitutive Models

摘要

Internationally indurated clays will be host rocks as well as barrier rock formations in case of radioactive waste disposal in deep geological formations. Therefore, laboratory tests on indurated clays together with physical modelling as well as numerical calculations simulating the EDZ development and the long-term behaviour of rock mass surrounding drifts and disposal chambers are important topics of todays international research work. There are many results of lab tests with indurated clays available in the literature now, e.g. investigations with indurated clays from the well-known sites of Mont Terri, Bure or Tournemire, Blumling, et al. (2005), Dossier (2005) Argile, Popp & Salzer (2007), Rejeb et al. (2006), Schulze & Hunsche (2005), Tsang et al. (2005), Zhang et al. (2007). In Germany the knowledge with respect to salt formations seems to be advanced but regarding argillaceous rock mass formations the German experienced knowledge is more or less limited to some geological and geomechanical experiences and observations. These have been made in context with tunnelling on one hand and with mining as well as specialised research work many years ago at the site of an abandoned iron-ore mine on the other hand. In recent times there is a good cooperation with neighboured European countries, especially France and Switzerland. For further information on current investigations in Germany see BGR (2007) and DBEtec (2007).