Convergence analysis of an unsupported micro-tunnel at the Meuse/Haute-Marne Underground Research Laboratory
| Autor: | L. M. Guayacán-Carrillo, A. Noiret, Gilles Armand, Jean Sulem, Siavash Ghabezloo, Darius Seyedi |
|---|---|
| Přispěvatelé: | Laboratoire Navier (navier umr 8205), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
[SPI.GCIV.GEOTECH]Engineering Sciences [physics]/Civil Engineering/Géotechnique 0211 other engineering and technologies Geology Ocean Engineering Geotechnical engineering 02 engineering and technology Convergence (relationship) 01 natural sciences 021101 geological & geomatics engineering 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | The Geological Society, London, Special Publications The Geological Society, London, Special Publications, Geological Society of London, 2017, 443 (1), pp.115-125. ⟨10.1144/SP443.24⟩ |
| ISSN: | 2041-4927 0305-8719 |
| Popis: | International audience; Convergence measurements recorded for one representative micro-tunnel (diameter c. 0.7 m) in Callovo-Oxfordian claystone were analysed. The micro-tunnel was excavated in the direction of the horizontal principal major stress. In situ observations showed anisotropic convergence with the maximum and minimum values in the horizontal and vertical directions, respectively. The horizontal closure of walls was fitted on the basis of a semi-empirical convergence law. This law is a predictive model reflecting the global response of the ground to excavation works. As the convergence measurements were performed after the end of excavation, their evolution in time can only be related to the time-dependent behaviour of the ground and the effect of the face advance cannot be captured. It is shown that some parameters of the semi-empirical law did not change along the micro-tunnel. An easy and efficient method is thus proposed for the long-term prediction of wall closure by the fitting of a single parameter on recorded data. Comparison with a drift (diameter c. 5 m) highlighted the influence of the support installation and the rate of excavation on the variation in the parameter values of the semi-empirical law. The vertical closure of the micro-tunnel walls, which showed a very weak evolution over time, was analysed based on the rate of convergence. |
| Databáze: | OpenAIRE |
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