RESEAL II - A large-scale in situ demonstration test for repository sealing in an argillaceous host rock - Phase II, Final report, EUR 24161
Document Date: 2009-12-02
Document Type: Project report
For plastic clays, it is believed that the breakthrough pressure corresponds with the minimum total stress (Volckaert et al., 1995b; Ortiz et al., 1997; Rodwell et al.,1999). The total stresses measured in the seal vary between 7 and 11 bar. Consequently, the measured breakthrough pressures are somewhat higher, but as mentioned before these measured breakthrough pressures should be considered as maximum values. Moreover, the shut in pressure observed in the first breakthrough test might be realistic and with a value of 8.3 bar lies within the range of total stresses measured inside the seal.
The radionuclide migration tests are still ongoing. Preliminary results of the migration in the EDZ seem to indicate that no preferential pathways for radionuclide migration exist.
A large amount of numerical modelling work has been performed as part of the RESEAL II project. The analyses have played an important role in assisting in the rational interpretation of the various tests performed in the project:
- Swelling pressure oedometer tests in the laboratory (hydromechanical analyses)
- Hydration stage of the shaft sealing test (hydromechanical analyses)
Programme(s): FP5-EAECTP C