“Transverse Action” – A model benchmark exercise for numerical analysis of the Callovo-Oxfordian claystone hydromechanical response to excavation operations

Seyedi, Darius; Armand, Gilles; Noiret, A.

doi:10.1016/j.compgeo.2016.08.008

Cited by 46 publications

(28 citation statements)

References 24 publications

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“…Convergences were also monitored in a number of measurement sections. A detailed account of the instrumentation at the GCS is given in Seyedi et al (2017).…”

Section: The Gcs Driftmentioning

confidence: 99%

“…Several characteristics of the FE simulation presented here correspond to the specification of the Transverse Action benchmark (Seyedi et al, 2017). The two main simplifying assumptions in the present analysis are the adoption of plane strain conditions and neglecting the gravity gradient.…”

Section: Main Features Of the Finite Element Modelmentioning

confidence: 99%

“…This paper presents a detailed simulation, using a different approach, of the GCS drift, a tunnel excavated parallel to the σ H direction at the MHM URL main level. A previous simulation of the excavation of this drift, in the context of the Transverse Action benchmark programme (Seyedi et al, 2017), has been reported by the authors (Mánica et al, 2017). Importantly, however, strain localisation was not considered in that work whereas the reproduction of localised deformations is the main focus of the present work.…”

Section: Introductionmentioning

confidence: 97%

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Numerical simulation of underground excavations in an indurated clay using non-local regularisation. Part 1: formulation and base case

et al. 2022

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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 nonlocal 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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“…Convergences were also monitored in a number of measurement sections. A detailed account of the instrumentation at the GCS is given in Seyedi et al (2017).…”

Section: The Gcs Driftmentioning

confidence: 99%

Section: Main Features Of the Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Numerical simulation of underground excavations in an indurated clay using non-local regularisation. Part 1: formulation and base case

et al. 2022

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“…The in situ principal stresses, at 490 m depth, are estimated to be σ v = 12.7 MPa in the vertical direction, σ h = 12.4 MPa in a horizontal direction, corresponding to the minor principal direction, and σ H = 16.1 MPa in the orthogonal horizontal direction, corresponding to the major principal stress (Seyedi et al, 2016). Figure 11 shows two cases of gallery orientation with respect to principal stress directions.…”

Section: Solved Initial Boundary Value Problemsmentioning

confidence: 99%

“…The application of the framework of computational homogenization provides a computationally efficient scale transition and has allowed the application of the FE 2 method for hydromechanical coupling on (semi-) engineering problems. This paper presents the application of the FE 2 model for hydromechanical coupling on the simulation of gallery excavations as part of the "Transverse action" benchmark by Andra (Seyedi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Modeling the strain localization around an underground gallery with a hydro-mechanical double scale model; effect of anisotropy

Eijnden

Bésuelle

Collin

et al. 2017

Computers and Geotechnics

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This paper concerns the application of a finite element squared (FE 2 ) approach for modelling hydromechanical coupling in the simulation of gallery excavation in the context of radioactive waste repositories. The micromechanics of Callovo-Oxfordian claystone is modelled at the microscale through representative elementary volumes (REVs), taking into account the interaction of different mechanical constituents and its interaction with pore fluid. In a framework of computational homogenization, the micromechanical behaviour is coupled to the macroscale boundary value problem of a poromechanical continuum with local second gradient paradigm. The simulations concern several cases of the "Transverse action" benchmark by Andra, in the context of which the FE 2 model is used. The explicit modelling of the material microstructure is used to introduce material anisotropy. The effect of the anisotropy in the initiation and evolution of strain localization in the excavation damaged zone (EDZ) around the gallery is studied and the influence on gallery convergence is demonstrated. A first-version model for solid-fluid interaction in the microstructure is applied here. As such, the objective of this work is to explore the capabilities of the model in capturing the general behaviour of the excavation damaged zone, rather than a quantitative reproduction of in-situ measurements. The application to the simulation of gallery excavation in the setting of the benchmark demonstrates the possibility of using the multiscale FE 2 approach for assessing engineering problems.

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Analytical poro‐elastic solution of deep lined tunnels in anisotropic rock with consideration of tunnel face advance

Tran,

Do,

Hoxha

et al. 2024

Num Anal Meth Geomechanics

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This paper aims at deriving a closed‐form solution for deep lined tunnels within a saturated anisotropic poro‐elastic medium. The derivation of the solution is carried out with the assumption of plane strain conditions along the tunnel axis, an isotropic elastic liner, a steady‐state flow, and perfect contact between the liner and rock. For this purpose, the complex potential function approach pioneered by Lekhnitskii for the anisotropic elastic body was used to develop the mechanical response of the rock mass. A complex hydraulic potential function is also introduced to solve the steady state fluid flow. Then the well‐known Biot theory is chosen to describe the hydro‐mechanical coupling of the anisotropic saturated rock. The stress and displacement solutions of both the liner and the surrounding rock, considering the tunnel face advance with respect to the considered section, are derived based on the principle of the convergence‐confining method. Comparisons with previous closed‐form solutions for isotropic case and finite element solution for anisotropic case were made to show the accuracy of the current closed form solution. Sensitivity analysis is performed based on this analytical solution to highlight the effect of some rock parameters on the stress and displacement of the liner.

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“Transverse Action” – A model benchmark exercise for numerical analysis of the Callovo-Oxfordian claystone hydromechanical response to excavation operations

Cited by 46 publications

References 24 publications

Numerical simulation of underground excavations in an indurated clay using non-local regularisation. Part 1: formulation and base case

Numerical simulation of underground excavations in an indurated clay using non-local regularisation. Part 1: formulation and base case

Modeling the strain localization around an underground gallery with a hydro-mechanical double scale model; effect of anisotropy

Analytical poro‐elastic solution of deep lined tunnels in anisotropic rock with consideration of tunnel face advance

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