WorldCat Identities

Gentier, Sylvie

Overview
Works: 10 works in 24 publications in 2 languages and 82 library holdings
Roles: Author, Thesis advisor, Other
Publication Timeline
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Most widely held works by Sylvie Gentier
Morphologie et comportement hydromécanique d'une fracture naturelle dans le granite sous contrainte normale : étude expérimentale et théorique by Sylvie Gentier( Book )

9 editions published between 1987 and 1988 in French and held by 31 WorldCat member libraries worldwide

L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 29 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
Fractures dans les roches cristallines : effets des déformations sur les circulations de fluides by Sylvie Gentier( Book )

2 editions published between 2002 and 2003 in French and held by 7 WorldCat member libraries worldwide

Modelisation geometrique d'un reseau de fractures dans un massif rocheux stratifie. application aux carrieres marbrieres de comblanchien) by FABRICE GERVAIS( Book )

3 editions published in 1993 in French and held by 5 WorldCat member libraries worldwide

LES RELEVES SYSTEMATIQUES DE TRACES DE FRACTURES ONT ETE EFFECTUES DANS LES CARRIERES MARBRIERES DE COMBLANCHIEN (COTE D'OR, FRANCE). CEUX-CI SERVENT DE BASE AU DEVELOPPEMENT DE METHODES DESTINEES A CARACTERISER, PUIS A MODELISER LA GEOMETRIE D'UN RESEAU DE FRACTURES DANS UN MASSIF ROCHEUX STRATIFIE. LE RESULTAT DE CETTE ETUDE EST LA PRESENTATION D'UN MODELE HIERARCHIQUE DE RESEAUX DE FRACTURES RESPECTANT LA GEOMETRIE DU RESEAU ET L'HISTOIRE TECTONIQUE DU MASSIF. OUTRE CE MODELE, QUELQUES PROPOSITION SONT AVANCEES POUR OPTIMISER ET PLANIFIER L'EXPLOITATION DES CARRIERES MARBRIERES DE COMBLANCHIEN, ET CECI A L'ECHELLE DU BLOC EXTRAIT PAR LES CARRIERES
Morphologie et comportement hydromécanique d'une fracture naturelle dans un granite sous contrainte normale : étude expérimentale et théorique by Sylvie Gentier( Book )

3 editions published in 1986 in French and held by 4 WorldCat member libraries worldwide

Image analysis for modelling shear behaviour( )

1 edition published in 2000 in English and held by 2 WorldCat member libraries worldwide

Through laboratory research performed over the past ten years, many of the critical links between fracture characteristics and hydromechanical and mechanical behaviour have been made for individual fractures. One of the remaining challenges at the laboratory scale is to directly link fracture morphology of shear behaviour with changes in stress and shear direction. A series of laboratory experiments were performed on cement mortar replicas of agranite sample with a natural fracture perpendicular to the axis of the core. Results show that there is a strong relationship between the fracture's geometry and its mechanical behaviour under shear stress and the resulting damage. Image analysis, geostatistical, stereological and directional data techniques are applied in combination to experimental data. The results highlight the role of geometric characteristics of the fracture surfaces (surface roughness, size, shape, locations and orientations of asperities to be damaged) in shear behaviour. A notable improvement in shear understanding is that shear behaviour is controlled by the apparent dip in the shear direction of elementary facets forming the fracture
Rougness and flow paths in a fracture by Sylvie Gentier( )

1 edition published in 1997 in English and held by 1 WorldCat member library worldwide

This paper is an attempt to show how image analysis and specially mathematical morphology associated with geostatistical methods can be useful and efficient tools in order to characterise the roughness and the flow paths in a fracture. The procedure for mapping the asperities of different sizes and heights is to use a top hat transformation of a grey tone function computed from the heights distribution of the fracture.The correct procedure for the identification of the possible flow paths in the void space of the fracture is first to apply a classical thresholding process to the image of the void space and next to generate a skeleton based on the boundaries of the subsets of the void space assumed to be of zero thickness; the cumulated apertures of the fracture are saved during the computationof the skeleton
Mechanical behavior of rock joints : influence of joint roughness on its closure and shear behavior by Alberto Varela Valdez( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

The shear behavior of rock joints under constant normal stress is studied using Discrete Element Method (DEM). The respective influences of joint surface roughness, elasticity of medium, fracture of surface asperities, and level of compression load on the closure and shear behaviors of rock joints are particularly analyzed. For the first time the roughness of the joints considered as self-affine is use dwith DEM to study the friction of rock joints, the roughness is described through three parameters:self-affine roughness exponent, self-affine correlation length and height variance. Using a numerical algorithm based on spectral method, eight isotropic self-affine surfaces corresponding to different roughness are generated. Latter, numerical surfaces are used as molds to generate the discrete elements surfaces. The discrete element modeling is premised on a preliminary calibration of the elastic properties performed on a representative elementary volume and on the implementation of the fracture properties (elliptic fracture criterion expressed in stress) describing with a reasonable accuracy the quasi-brittle fracture behavior of mortar (used in previous experimental tests). On this basis and once the roughness surfaces implemented in DEM, the simulations of the compression/closure test are performed on the eight joints and this for two compression stress levels: 14 MPa and 21 MPa. Then, the eight DEM joints are sheared along two perpendicular directions. For each shear direction and each level of compression stress, the joints are tested through three different mechanical models: 1) rigid model in which the medium cannot deform excepted at the contact surface of joints, 2) elastic model in which the medium can deform in its volume and 3) elastic-fracture model in which the medium can deform in its volume and the bondsbetween discrete elements can failed according to the elliptic fracture criterion. The use of these three mechanical models allows studying systematically the influence of the roughness alone (rigidmodel), the influence of elasticity and roughness (elastic model) and finally, the combined effect ofthe joint roughness, of the elasticity and of the fracture (elastic-fracture model). The study of the results obtained from the DEM simulations is followed by an energetic analysis allowing theestimation of the evolutions, as a function of the shear displacement, of the elastic energy stored inthe system, of the friction energy, of the work related to the joint dilatancy and of the energy dissipated by internal damping of the DEM
Granitic core cross sections: numerical modelling by Joëlle Riss( )

1 edition published in 2001 in English and held by 1 WorldCat member library worldwide

Starting from RGB images of granitic core cross sections, this paper is an attempt to derive the most representative numerical models as possible for thecore sections: each pixel is given a label (false colour) related to its mineral nature (K-Feldspars, Plagioclase, Quartz, Fe-Mg minerals, etc.); thesemodels are needed by scientists involved in the hydro-mechanical behaviorof rock masses taking into account their textural and physical characteristics. Since a numerical model is derived, characterising either thesize and shape of various components or the stereological parameters (AA, BA, NA, etc.) or their spatial structure (covariance, etc) is straightforward. Accordingly, we focus our attention on the segmentation process: the partition of the initial image is not easy because we need to getn =4 disjoint sets (one for each mineral component) but the union of these sets must be equal to the initial image itself. It is sometimes easier to workwith one channel for one mineral component and with an other one for an other mineral component, so we have often to make a decision in the design of the image processing and segmentation. What mineral component has to be first segmented and how to take the result into account during the segmentation of the others mineral phases? Since quartz is the last phase to crystallise in granitic magma and translucent, it will be the last mineral phase to be identified according to the rule: a pixel that is neither K-Feldspars nor plagioclase or Fe-Mg minerals is given a quartz label. However some problems arise and are discussed in the paper
Spherical distribution of fracture surface elements from linear and/or areal roughness by Sylvie Gentier( )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

 
Audience Level
0
Audience Level
1
  General Special  
Audience level: 0.86 (from 0.78 for Fractures ... to 0.97 for Morphologi ...)

Languages
French (19)

English (5)