Using Shear Strain Localisation to Model the Fracturing Around Gallery in Unsaturated Callovo-Oxfordian Claystone

Pardoen, Benoît; Levasseur, Séverine; Collin, Frèdèric

doi:10.1007/978-3-319-13506-9_41

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…The fracture spacing was about 0.5 m. Similar patterns are also found in stiff clay at Bure, France [ Armand et al ., , ; Wileveau and Bernier , ]. Some theoretical and numerical models have been developed in an attempt to simulate such a pattern and the processes leading to it [ Van den Eijnden et al ., ; Pardoen et al ., ; Yao et al ., ].…”

Section: Hydrologic Issues Related To a Nuclear Waste Repository In Cmentioning

confidence: 99%

Hydrologic issues associated with nuclear waste repositories

2015

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Significant progress in hydrology, especially in subsurface flow and solute transport, has been made over the last 35 years because of sustained interest in underground nuclear waste repositories. The present paper provides an overview of the key hydrologic issues involved, and to highlight advances in their understanding and treatment because of these efforts. The focus is not on the development of radioactive waste repositories and their safety assessment, but instead on the advances in hydrologic science that have emerged from such studies. Work and results associated with three rock types, which are being considered to host the repositories, are reviewed, with a different emphasis for each rock type. The first rock type is fractured crystalline rock, for which the discussion will be mainly on flow and transport in saturated fractured rock. The second rock type is unsaturated tuff, for which the emphasis will be on flow from the shallow subsurface through the unsaturated zone to the repository. The third rock type is clay-rich formations, whose permeability is very low in an undisturbed state. In this case, the emphasis will be on hydrologic issues that arise from mechanical and thermal disturbances; i.e., on the relevant coupled thermo-hydromechanical processes. The extensive research results, especially those from multiyear large-scale underground research laboratory investigations, represent a rich body of information and data that can form the basis for further development in the related areas of hydrologic research. General IntroductionSignificant progress in hydrology, especially in subsurface flow and solute transport, has been made over the last 35 years because of sustained interest in the performance assessment of proposed underground nuclear waste repositories. The present paper attempts to provide an overview of the key hydrologic issues involved and to highlight the advances in their understanding and treatment because of these efforts. This paper is not focused on the development of high-level nuclear waste repositories and their safety assessment; it focuses instead on the advances in hydrologic science which have emerged from such studies. These advances may find applications in other hydrology-related problems of current importance at the national and international levels, such as environmental contamination remediation, carbon dioxide geosequestration, and natural gas production through fracking.In the next section, we present, in a general way, the context for the hydrologic framework related to performance and safety assessment of underground nuclear waste repositories that are proposed to be constructed in three particular rock formations-crystalline rock, unsaturated tuffs, and clays. Then, we discuss some particularly challenging factors concerning the research common to these three formations. This discussion will be followed by three sections devoted to each of these three rock types, respectively, to present a review of hydrologic research in these areas.

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Section: Hydrologic Issues Related To a Nuclear Waste Repository In Cmentioning

confidence: 99%

Hydrologic issues associated with nuclear waste repositories

2015

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“…In this work, we propose to represent 275 the fractures around galleries with shear strain localisation [29,30,31], which requires an appropriate numerical method to avoid mesh dependency. In fact, a pathological problem of mesh dependency is inherent to strain localisation modelling with classical finite element methods [32,33].…”

Section: Balance Equationsmentioning

confidence: 99%

Permeability evolution and water transfer in the excavation damaged zone of a ventilated gallery

Pardoen

Talandier²,

Collin

2016

International Journal of Rock Mechanics and Mining Sciences

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The fluid transfers occurring around underground galleries are of paramount importance when envisaging the long-term sustainability of underground structures for nuclear waste disposal. These transfers are mainly conditioned by the behaviour of the surrounding material and by its interaction with the gallery air. The hydro-mechanical behaviour of the excavation damaged zone, which develops around galleries due to the drilling process, is thenceforward critical because it is composed of fractures having a significant irreversible impact on flow characteristics and transfer kinetics. Besides, the material interaction with the gallery air may engender water drainage and desaturation. Thus, a gallery air ventilation experiment, preceded by its excavation, is numerically modelled in an unsaturated argillaceous rock to study its influence on hydraulic transfers. surements. After the excavation, the hydraulic transfers are studied through the reproduction of a gallery air ventilation experiment that implies drainage and desaturation of the surrounding rock. These transfers depend on liquid water and water vapour exchanges at gallery wall that are introduced through a non-classical boundary condition. The model prediction successfully captures the drainage and desaturation kinetics of undisturbed and damaged rock.

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“…An evolution of the hydraulic permeability in the shear bands can be 945 added in the model (Pardoen et al, 2014(Pardoen et al, , 2015b by considering a dependency with a mechanical parameter (Olivella & Alonso, 2008).…”

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Shear banding modelling in cross-anisotropic rocks

Pardoen

Seyedi²,

Collin

2015

International Journal of Solids and Structures

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Sedimentary geomaterials such as rocks frequently exhibit cross-anisotropic properties and their behaviour depends on the direction of loading with respect to their microstructure. As far as material rupture is concerned, localised deformation in shear band mode appears generally before cracks and material failure. cavation fractured zone that develops around a gallery is strongly influenced by the material anisotropy.

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Using Shear Strain Localisation to Model the Fracturing Around Gallery in Unsaturated Callovo-Oxfordian Claystone

Cited by 7 publications

References 7 publications

Hydrologic issues associated with nuclear waste repositories

Hydrologic issues associated with nuclear waste repositories

Permeability evolution and water transfer in the excavation damaged zone of a ventilated gallery

Shear banding modelling in cross-anisotropic rocks

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