| Issue |
E3S Web Conf.
Volume 700, 2026
Journées Scientifiques AGAP Qualité 2026
|
|
|---|---|---|
| Article Number | 02004 | |
| Number of page(s) | 6 | |
| Section | Geophysical Measurements Using Optical Fiber | |
| DOI | https://doi.org/10.1051/e3sconf/202670002004 | |
| Published online | 23 March 2026 | |
Potential of embedded Fiber Bragg Grating networks for seismic characterization of an Excavated Damaged Zone
1 Gustave Eiffel University, GERS-GéoEND, Route de Bouaye, allée des ponts et chaussées, Bouguenais, 44344, France
2 Université Paris-Saclay, CEA, List, F-91120, Palaiseau, France
3 Agence Nationale Pour la Gestion des Déchets Radioactifs (ANDRA), DISTEC/DRG Department, 1 – 7 rue Jean Monnet, Châtenay-Malabry, 92298, France
Abstract
Seismic methods offer a non-destructive and repeatable solution adapted to the long-term monitoring of the zone affected by the excavation of galleries in deep geological repositories. This study provides preliminary observations and feedback from an in-situ experiment conducted in the Bure Underground Research Laboratory (Meuse, France). A network of Fiber Bragg Grating (FBG) sensors was embedded in boreholes drilled perpendicularly to the wall of a gallery through the first meters affected by the excavation, to assess our ability to measure P-wave propagation velocities and their temporal variations. A newly developed interrogation system was tested in real conditions. Reference accelerometers were embedded for comparison. Two high-frequency active seismic campaigns (1-5 kHz) were conducted for this purpose. Preliminary velocity models are presented. The benefits of this approach and the challenges to overcome in terms of signal-to-noise ratio are summarized in this contribution.
© The Authors, published by EDP Sciences, 2026
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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