In assessing the performance of a deep HLW repository, the evolution of the excavated damaged zone with time is a key issue. In the framework of SELFRAC fracturing, self-sealing and self-healing processes of Opalinus and Boom clay were studied in laboratory and in situ experiments. Definitions for the terms excavation damaged zone (EDZ), excavation disturbed zone (EdZ), sealing and healing are presented. It is shown that sealing and partial healing occur and the consequences of the results for performance assessment of HLW disposal in argillaceous rocks are discussed. The results of several in situ experiments and observations at the HADES underground research facility are detailed.
|Journal||Physics and Chemistry of the Earth|
|State||Published - Feb 2007|
|Event||Clays in Natural & Engineered Barriers for Radioactive Waste Confinement - ANDRA, Tours|
Duration: 14 Mar 2005 → 18 Mar 2005