Monitoring the excavation damaged zone by three dimensional reconstruction of the electrical resistivity

Nolwenn Lesparre 1 Dominique Gibert 2 Florence Nicollin 3 Christophe Nussbaum 4 Andy Adler 5
1 IPGP - Institut de Physique du Globe de Paris
2 Imagerie Géophysique des Systèmes Complexes
IPGP - Institut de Physique du Globe de Paris
3 GR - Géosciences Rennes
4 Federal Office of Topography swisstopo
5 Department of Systems and Computer Engineering [Ottawa]
Abstract : A damaged zone is formed during the excavation of underground galleries, altering the rock properties. From a perspective of nuclear waste storage in deep geological sites, there is a clear interest to monitor the rock properties in such zones. We constructed electrical resistivity tomograms as a function of time to monitor the damaged area in gallery 04 of the Mont Terri underground rock laboratory (Switzerland). Measurements were performed using electrode rings surrounding the gallery. The experience showed a heterogeneous distribution of damages around the gallery and their fast formation after the excavation. Two main areas were concerned by damage formation, located in regions where the bedding was tangential to the excavated gallery. Such regions represented an extension of about 2 m along the gallery walls and reached a depth of 1.5 m. Main damages were created during the next months following the excavation process. Slight variations were still observed 3 yr after the excavation that may be related to the gallery environmental condition fluctuation. The method applied here demonstrates the interest to monitor the whole region surrounding excavated galleries dedicated to host nuclear wastes.
Keywords : Geomechanics image processing Tomography Electrical properties
Type de document :
Article dans une revue
Geophysical Journal International, Oxford University Press (OUP), 2013, 195 (2), pp.972-984. 〈10.1093/gji/ggt282〉
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Nolwenn Lesparre, Dominique Gibert, Florence Nicollin, Christophe Nussbaum, Andy Adler. Monitoring the excavation damaged zone by three dimensional reconstruction of the electrical resistivity. Geophysical Journal International, Oxford University Press (OUP), 2013, 195 (2), pp.972-984. 〈10.1093/gji/ggt282〉. 〈insu-00912987〉

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