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Convergence analysis of an unsupported micro-tunnel at the Meuse/Haute-Marne Underground Research Laboratory

By
L.-M. Guayacán-Carrillo
L.-M. Guayacán-Carrillo
ANDRA R&D, 92298 Chatenay-Malabry, FranceUniversité Paris-Est, Laboratoire Navier/CERMES, Ecole des Ponts ParisTech, IFSTTAR, CNRS, 77455 Marne la Vallée, France
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J. Sulem
J. Sulem
Université Paris-Est, Laboratoire Navier/CERMES, Ecole des Ponts ParisTech, IFSTTAR, CNRS, 77455 Marne la Vallée, France
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D. M. Seyedi
D. M. Seyedi
ANDRA R&D, 92298 Chatenay-Malabry, France
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S. Ghabezloo
S. Ghabezloo
Université Paris-Est, Laboratoire Navier/CERMES, Ecole des Ponts ParisTech, IFSTTAR, CNRS, 77455 Marne la Vallée, France
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A. Noiret
A. Noiret
ANDRA R&D, Meuse/Haute-Marne Underground Research Laboratory, 55290 Bure, France
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G. Armand
G. Armand
ANDRA R&D, Meuse/Haute-Marne Underground Research Laboratory, 55290 Bure, France
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Published:
January 01, 2017

Abstract

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.

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Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
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J. Bruno
J. Bruno
Amphos 21, Spain
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M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
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E. Verhoef
E. Verhoef
COVRA, The Netherlands
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Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

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