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Back-Analysis of Shaft and Galleries' Geomechanics Behaviour in the Meuse/Haute-Marne Underground Laboratory
The Andra’s (French National Agency for Radioactive Waste Management) Meuse / Haute-Marne Underground Research Laboratory in Bure is currently under extension (4th extension), with the excavation of new galleries having different shapes and support types. The galleries are excavated in the Callovo-Oxfordian (COx) claystone, with a creeping behaviour, at 490 m depth. The continuum rheological model which has been considered (among the available ones) is an elasto-visco-plastic model with the Hoek-Brown failure criterion and the Lemaître creep law. The choice of the rock parameters to be used for the design studies of the 4th extension (aiming to verify the stability of support systems over a service duration of 20 yr) has been based on two sets, defined in previous studies and calibrations. The in-situ measurements, provided by the R&D division of Andra, of three galleries and a shaft, excavated about 10 yr ago, have been back-analysed with these two sets of parameters. The comparison of results led to the choice of the most suitable set of parameters for the design of the new extension galleries.
Back-Analysis of Shaft and Galleries' Geomechanics Behaviour in the Meuse/Haute-Marne Underground Laboratory
The Andra’s (French National Agency for Radioactive Waste Management) Meuse / Haute-Marne Underground Research Laboratory in Bure is currently under extension (4th extension), with the excavation of new galleries having different shapes and support types. The galleries are excavated in the Callovo-Oxfordian (COx) claystone, with a creeping behaviour, at 490 m depth. The continuum rheological model which has been considered (among the available ones) is an elasto-visco-plastic model with the Hoek-Brown failure criterion and the Lemaître creep law. The choice of the rock parameters to be used for the design studies of the 4th extension (aiming to verify the stability of support systems over a service duration of 20 yr) has been based on two sets, defined in previous studies and calibrations. The in-situ measurements, provided by the R&D division of Andra, of three galleries and a shaft, excavated about 10 yr ago, have been back-analysed with these two sets of parameters. The comparison of results led to the choice of the most suitable set of parameters for the design of the new extension galleries.
Back-Analysis of Shaft and Galleries' Geomechanics Behaviour in the Meuse/Haute-Marne Underground Laboratory
Lecture Notes in Civil Engineering
Barla, Marco (editor) / Di Donna, Alice (editor) / Sterpi, Donatella (editor) / Janutolo Barlet, Michele (author) / Monfared, Mohammad (author) / Martin, François (author) / Bril, Olivier (author) / Armand, Gilles (author) / Camusso, Marco (author)
International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2021 ; Turin, Italy
2021-01-15
8 pages
Article/Chapter (Book)
Electronic Resource
English
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