Journal
GEOTECHNIQUE
Volume 72, Issue 12, Pages 1092-1112Publisher
ICE PUBLISHING
DOI: 10.1680/jgeot.20.P.246
Keywords
anisotropy; COx clay-stone; deep tunnel; finite-element methods; fractured zone; indurated clay; non-local; numerical modelling; tunnels
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Funding
- Conacyt scholarship [270190]
- French national radioactive waste management agency (Andra)
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This paper presents a numerical simulation of an underground excavation in the Callovo-Oxfordian claystone formation, focusing on the hydromechanical behavior and water pressure evolution. The simulation successfully reproduces the extent and configuration of the excavation-induced fractured zone, rock displacements, and water pressure changes by incorporating an appropriate constitutive model and parameters.
The paper presents the numerical simulation of an underground excavation in the Callovo-Oxfordian argillaceous formation, performed in the Meuse/Haute-Marne underground research laboratory, within the context of deep geological nuclear waste disposal. The constitutive model adopted incorporates a number of characteristic features of the hydromechanical behaviour of the Callovo-Oxfordian claystone, and other indurated clays, including anisotropy and time-dependent deformations. Model parameters have been largely determined from available experimental results. Particular attention has been given to the incorporation of a non-local formulation in order to simulate localised deformations objectively. It is shown that the numerical analysis is able to provide a very satisfactory reproduction of the extent and configuration of the excavation-induced fractured zone, the development of rock displacements and the evolution of water pressures in the rock. The analysis is also able to provide a deeper insight into the mechanisms underlying the generation of water pressures inside the rock mass.
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