Community Research and Development Information Service - CORDIS

Long term behaviour of the structure and surroundings of radioactive waste repositories

Follow up and monitoring of the long term behaviour of the concrete lined part, also called Test Drift, of the HADES underground research facility, of its terminal shotcreted front and of the surrounding clay mass.

Measurements around the Test Drift show a slow stabilization.

Comparison between pressure and deformation on the different measuring sections show a good agreement of the convergence and confinement curves.

Comparison between direct measurements of the lining pressure (by way of pressure cells) and calculated ones (from load cell measurements) showed that pressure cells measurements were systemically lower than those of the load cells. This was due to a significant drift of the zero point value of the internal pressure transducer. After recalibration, all measures were in good agreement and pressure build-up was similar.

Measurements of the displacements in the clay mass above the Test Drift (settlingmeter and inclinometer devices installed before construction) were compared to those, at the same distance of the gallery axis, of the extensometer installed during the construction: the delayed convergence (the displacement after installation of the lining, measured by the second device) is only a small part of the total one. This is confirmed by the comparison between the clay wall displacement (inferred from the first type of devices) and the lining diametrical convergence.

Reported by

Organisme National des Dechets Radioactifs et des Matieres Fissiles Enrichies
Place Madou 1 BP 24/25
1210 Bruxelles
Belgium
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