Effect of thermo-hydro-mechanical coupling on the evolution of stress in the concrete liner of an underground drift in the Cigéo project

Alonso, M.; Vu, Minh Ngoc; Vaunat, Jean; Armand, Gilles; Gens, Antonio; Plúa, C.; Lesquen, C. De; Ozanam, O.

doi:10.1088/1755-1315/833/1/012200

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…The convergence measurement of drifts within the URL exhibits not only a complex timedependent behavior but also an anisotropy of the convergence in all drifts [2][3][4]. Completed by many other studies conducted in laboratories, it has also been shown that the shortterm behavior of this host rock seems to be predominant by the elastoplastic and damage mechanisms, while at the long term, the creep behavior is dominant [5]. Further, a high dispersion of the mechanical properties of COx claystone due to their dependence on mineralogical composition has been observed.…”

Section: Introductionmentioning

confidence: 90%

Time-Dependent Behavior of Callovo-Oxfordian Claystone for Nuclear Waste Disposal: Uncertainty Quantification from In-Situ Convergence Measurements

Tran²,

Hoxha

et al. 2022

Sustainability

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The sustainability of geotechnical infrastructures is closely linked with their long-time behavior. In fact, there is not a straightforward procedure to predict this behavior, and very often, the back analyses of observed data are the best tool to understand their long-time response. In-situ observations of drifts constructed in the Callovo-Oxfordian (COx) claystone, the potential host formation for geological radioactive waste disposal, in France exhibit a progressive convergence. These convergence measurements with quite significant dispersions reveal a considerable uncertainty of time-dependent behavior of this argillaceous rock that can strongly affect the transmit loading to liners, hence the long term stability of the drift. Consequently, the uncertain quantification of the creep behavior of COx claystone presents an important task before analyzing the safety of the waste disposal system. In this work, this challenge was conducted by using the well-known Bayesian inference technique. For this aim, on the one hand, the effectiveness of the classical and hierarchical Bayesian techniques to quantify the epistemic and aleatoric uncertainties of the time-dependent behavior of the host rock were investigated using synthetic data. On the other hand, we dealt with the uncertain quantification of the Lemaitre parameters that characterize the visco-plastic behavior of COx claystone thanks to the real data of in-situ convergence measurements of drifts.

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Section: Introductionmentioning

confidence: 90%

Time-Dependent Behavior of Callovo-Oxfordian Claystone for Nuclear Waste Disposal: Uncertainty Quantification from In-Situ Convergence Measurements

Tran²,

Hoxha

et al. 2022

Sustainability

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Long-term Evolution of Bentonite-Based Seals for Closure of a Radioactive Waste Repository in Claystone: A Hydro-Chemo-Mechanical Modelling Assessment

Laviña,

Pelegrí,

Idiart

et al. 2023

Transp Porous Med

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Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

Song

Rodríguez-Dono

Farfan

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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When modelling rock masses that behave anisotropically and in addition present a time dependent behaviour, it is relevant to select a constitutive model able to represent their actual behaviour realistically. This article presents an alternative anisotropic time-dependent constitutive model able to predict the coupling between anisotropic behaviour and time-dependent (or viscous) behaviour. The viscous behaviour is simulated with the Burgers model and all elastic springs and viscous dashpots are considered to exhibit transversely isotropic properties. The proposed constitutive model has been implemented in the finite element method software CODE_BRIGHT. To verify the basic anisotropic elastic solution, it has been compared with that of PLAXIS results. And to verify the isotropic viscoelastic solution, it has been compared with analytical solutions. Furthermore, the proposed constitutive model has been used to predict the behaviour of samples from laboratory tests. Finally, parametric analyses have been carried out to investigate the influence of different factors on tunnelling responses, including the selection of different constitutive models, anisotropy of initial stresses and anisotropy of material properties. The proposed model provides an alternative method for the preliminary design of geotechnical engineering works involving geomaterials that exhibit anisotropic time-dependent behaviour.Article highlights • An anisotropic time-dependent model has been implemented in CODE_BRIGHT and validated. • The model can predict the coupled anisotropic time-dependent behaviour of geomaterials. • Parametric analyses have been performed to study the influence of different factors in ground response.

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Effect of thermo-hydro-mechanical coupling on the evolution of stress in the concrete liner of an underground drift in the Cigéo project

Cited by 5 publications

References 16 publications

Time-Dependent Behavior of Callovo-Oxfordian Claystone for Nuclear Waste Disposal: Uncertainty Quantification from In-Situ Convergence Measurements

Time-Dependent Behavior of Callovo-Oxfordian Claystone for Nuclear Waste Disposal: Uncertainty Quantification from In-Situ Convergence Measurements

Long-term Evolution of Bentonite-Based Seals for Closure of a Radioactive Waste Repository in Claystone: A Hydro-Chemo-Mechanical Modelling Assessment

Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

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