References of "Levasseur, Séverine"
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See detailModeling of strain localization around the radioactive waste disposal galleries
Salehnia, Fatemeh ULg; Charlier, Robert ULg; Levasseur, Séverine ULg

in Coupled Phenomena in Environmental Geotechnics (2013)

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See detailOn micromechanical damage modeling in geomechanics: influence of numerical integration scheme
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg et al

in International Journal of Computational & Applied Mathematics (2013), 246

Tunnel excavations in deep rocks provide stress perturbations which initiate diffuse and/or localized damage propagation in the material. This damage phenomenon can lead to significant irreversible ... [more ▼]

Tunnel excavations in deep rocks provide stress perturbations which initiate diffuse and/or localized damage propagation in the material. This damage phenomenon can lead to significant irreversible deformations and changes in rock properties. In this paper, we propose to model such behavior by considering a micromechanically-based damage approach. The resulting micromechanical model, which also accounts for initial stress, is described and assessed through the numerical analysis of a synthetic tunnel drilling in Opalinus Clay. A particular emphasis is put on the numerical integration of the model. In particular, an appropriate choice of the latter is required to ensure the numerical stability and a confident prediction of excavation damaged zone around tunnels. [less ▲]

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See detailAxisymmetric transient modelling of a wind turbine foundation in cohesionless soil using the Prevost’s model
Cerfontaine, Benjamin ULg; Levasseur, Séverine ULg; Charlier, Robert ULg

in Computational Methods in Marine Engineering (2013)

Suction caissons are more and more used for offshore foundations. This paper deals with the cyclic modelling of suction caissons using the Prevost's model. The case study is a 8m large diameter embedded ... [more ▼]

Suction caissons are more and more used for offshore foundations. This paper deals with the cyclic modelling of suction caissons using the Prevost's model. The case study is a 8m large diameter embedded in dense No. 0 Lund sand. Parameters for the model are calibrated using drained triaxial tests. A parametric study concerning the influence of the constitutive law, the skirt length and permeability is carried out. [less ▲]

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See detailInverse soil parameter identification of an earth and rockfill dam by genetic algorithm optimization
Vahdati, Pooya; Levasseur, Séverine ULg; Mattsson, Hans et al

in Sharing Experience for Safe and Sustainable Water Storage (2013)

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See detailMicrocracks-induced damage modelling for transversely isotropic rock
Levasseur, Séverine ULg; Welemane, Hélène; Kondo, Djimédo

in 3rd International Symposium on Computational Geomechanics (ComGeo III) (2013)

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See detailA micro–macro approach of permeability evolution in rocks excavation damaged zones
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg et al

in Computers & Geotechnics (2013), 49

Excavation damaged zone, with significant irreversible deformations and nonnegligible changes in flow and transport properties generally occurs in indurated clay around underground structures. The stress ... [more ▼]

Excavation damaged zone, with significant irreversible deformations and nonnegligible changes in flow and transport properties generally occurs in indurated clay around underground structures. The stress perturbation around the excavation could lead to a significant increase of the permeability physically due to diffuse and/or localized microcracks growth in the material. In the present study, we investigate microcracks-induced damage processes together with the subsequent modification in permeability. The proposed approach is based on a homogenization-based upper bound extended to the context of micro-cracked media in presence of initial stress. Application of this approach is done on a borehole excavation problem related to the Selfrac in situ experiments on Opalinus Clay. Although, the model fails to quan-titatively account for the in situ permeability change (which may also originated from existing macro-fractures), its prediction shows a significant evolution of the material permeability around the borehole. This is in qualitative agreement with available data. [less ▲]

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See detailModelling the excavation damaged zone in Callovo-Oxfordian claystone with strain localization
Pardoen, Benoît ULg; Collin, Frédéric ULg; Levasseur, Séverine ULg et al

Conference (2012, October)

Gallery excavation in clayey rocks induces stress perturbations that trigger damage propagation. The excavation process creates then the so-called excavation damaged zone in which properties are modified ... [more ▼]

Gallery excavation in clayey rocks induces stress perturbations that trigger damage propagation. The excavation process creates then the so-called excavation damaged zone in which properties are modified. The prediction of the extension and especially of the fracturing structure in this zone remains a crucial issue in the context of underground storage. Since strain localization in shear band mode is frequently observed in experimental works, the excavation damaged zone can be modeled by considering the development of strain localization bands. A hydro-mechanical modelling of a gallery excavation is performed. The numerical results exhibit an excavation damaged zone extension similar to the in situ measurements and provides information about the rock state within this zone. [less ▲]

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See detailAnisotropic hydromechancial modelling of HGA field-scale experiment in Opalinus Clay
Levasseur, Séverine ULg; Collin, Frédéric ULg; François, Bertrand et al

Conference (2012)

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See detailField scale experiment modelling in Opalinus Clay: the HGA experiment
Levasseur, Séverine ULg; Collin, Frédéric ULg; François, Bertrand et al

in Clays in Natural & Engineered Barriers for Radioactive Waste Confinement, 2012 (2012)

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See detailModelling of the Excavation Damaged Zone in Opalinus Clay
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg

in Post-TIMODAZ International Workshop THM effects in clay host rocks for radioactive waste repositories (2012)

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See detailNumerical modelling in TIMODAZ: developments and achievements
Charlier, Robert ULg; Collin, Frédéric ULg; Levasseur, Séverine ULg

in Post-TIMODAZ International Workshop THM effects in clay host rocks for radioactive waste repositories (2012)

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See detailAnisotropic damage model for microcracked materials
Levasseur, Séverine ULg

Diverse speeche and writing (2012)

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See detailAnisotropic damage model with initial stresses for microcracked materials
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg et al

in Fifth International Conference on Advanced COmputational Methods in ENgineering (ACOMEN 2011) (2011)

In a recent study (Levasseur et al., 2010), we proposed a class of isotropic damage models which account for initial stresses. The present paper extends this approach to anisotropic damage due to growth ... [more ▼]

In a recent study (Levasseur et al., 2010), we proposed a class of isotropic damage models which account for initial stresses. The present paper extends this approach to anisotropic damage due to growth of an arbitrarily penny-shaped microcracks system. The basic principle of the upscaling technique in the presence of initial stress is first recalled. Then, we derive a closed-form expression of the elastic energy potential corresponding to a system of arbitrarily oriented microcracks. Thanks to the investigation of the influence of initial stresses on the material response under non monotonous loading paths, it is shown how the coupling between initial stresses and damage is strongly dependent of the microcracks density and orientation. In case of a particular distribution of microcracks orientation, described by a second order damage tensor, this model corresponds to a generalization of the macroscopic damage model of Halm and Dragon (1996), for which a physically-based interpretation can be proposed. [less ▲]

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