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Final Activity Report - RESEAL II (A large scale in situ demonstration test for repository sealing in an argillaceous host rock - phase II)

Project ID: FIKW-CT-2000-00010
Funded under: FP5-EAECTP C


This is the final report of the RESEAL II project funded under the European Commission (EC)'s Fifth Framework Programme (FP5). The aim of the project was to demonstrate on a representative scale that the sealing of a shaft i.e. the 'experimental' shaft of the HADES underground laboratory, with a low permeability powder / pellets mixture of bentonite avoids preferential migration of water, gas or radionuclides either through the seal of through the excavation disturbed zone around it. This report is fully stand-alone, however, for some details it refers to Volckaert et al. (2000). The report first describes the results of laboratory tests that aimed at gaining more insight into the hydro-mechanical behaviour of the FoCa pellet / powder mixture as used in the shaft sealing experiment. In the second chapter it shortly repeats the design, installation and hydration of the borehole seal as described in Volckaert et al. (2000) and includes information on the performance testing of this borehole seal. The third chapter illustrates the design and installation of the shaft seal experiment and focuses on the hydro-mechanical evolution during hydration and the performance of the seal after saturation. The fourth chapter describes the different hydro-mechanical codes used and the results of their application on laboratory tests and the borehole and shaft seal experiments. Finally, chapter five gives an overview of the literature data on the seal requirements and gives the conclusion of this project with respect to performance assessment.

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