Étude comparée de la fracturation observable sur carottes de forage et obtenue par diagraphie. Application au marbre de Saint-Béat (31)

Gasc‐Barbier, Muriel; Fouché, Olivier; Gaillard, Christian

doi:10.1051/geotech/2010133037

Cited by 2 publications

(2 citation statements)

References 6 publications

(6 reference statements)

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“…Acoustic image logging is a fairly efficient method for exploring discontinuities in a timely and cost-efficient fashion (RIFP, 1991) and is a complement to the visual analysis of drill cores (Mari and Coppen, 1993). Several televiewer applications for improving the geotechnical and structural analysis of the subsurface can be found in the literature (Schepers et al, 2001;Kabir et al, 2009;Blake, 2010;Gasc-Barbier et al, 2010;Altadonna and Fulton, 2012;Hallahan et al, 2013). The televiewer can also be adapted to the specific geological context.…”

Section: Introductionmentioning

confidence: 97%

Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Peyras¹,

Rivard

Breul

et al. 2015

Engineering Geology

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Section: Introductionmentioning

confidence: 97%

Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Peyras¹,

Rivard

Breul

et al. 2015

Engineering Geology

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“…Because stability analyses are generally based on the consideration of families of fractures, how structural orientations aggregate influences the design of engineered slopes. This influence is investigated in this study, while considering uncertainties in the data obtained from a mapping procedure might be more significant than the grouping method selected (Gasc-Barbier et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Grouping discontinuities in representative sets: influence on the stability analysis of slope cuts

Nguyen

Merrien‐Soukatchoff²,

Vinches

et al. 2015

Bull Eng Geol Environ

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International audienceBased on their orientation, different methods of grouping discontinuities in sets can be used; thus, three grouping methods and their influence on subsequent stability analyses are compared in this study. The first method combines the approaches of Priest, Shanley, Mathab and Yegulalp; the second method consists of grouping discontinuities manually based on an examination of density contour plots; and the third method is based on the spectral method. Unlike the others, the first method allows for the automatic determination of the number of discontinuity sets. The first and third methods were programmed in the Mathematica software environment, while DIPS software was used for the second method. Depending on the grouping process used, each discontinuity or only a portion of all discontinuities is assigned to a set. Therefore, the results in terms of the number of sets; the mean and dispersion of the sets; and the spacing of a given set differ with different methods. The consequences of a statistical analysis of orientation on the stability analysis were studied with simulations using RESOBLOK software, which couples the construction of 3D geometric block systems and a quick, iterative, limit-equilibrium stability analysis. Different fracture networks were generated with variable input parameters that were derived from previous statistical analyses of orientation and spacing. The software provides statistical outputs, such as the number and volume of unstable blocks, that can be compared across different cases. An application in a cutting slope near Ax-les-Thermes is presented; the influence of the grouping methods and of the uncertainty of slope orientation on stability indicators is presented. A synthetic indicator of global stability is also proposed.Il existe différentes méthodes de regroupement des discontinuités en familles en fonction de leur orientation. Trois méthodes de regroupement sont comparées ainsi que leur influence sur l’analyse de stabilité. La première méthode combine les approches de Priest, Shanley, Mathab et Yegulalp. La seconde consiste à regrouper “manuellement” les discontinuités en se basant sur les contours d’isodensité de fractures et la troisième se base sur la méthode spectrale. La première et la troisième méthode ont été programmées dans l’environnement Mathematica tandis que le logiciel DIPS a été utilisé pour le regroupement “manuel”. Selon la méthode de regroupement utilisée, l’ensemble des discontinuités ou seulement une partie d’entre elles sont affectées à une famille. La moyenne et la dispersion des orientations, ainsi que l’espacement entre fractures, diffèrent d’une méthode à l’autre. Les conséquences de l’analyse statistique des orientations sur l’analyse de stabilité sont étudiées par des simulations réalisées avec le logiciel RESOBLOK. Ce code associe une génération géométrique stochastique 3D d’un massif fracturé et une analyse rapide de stabilité, itérative, basée sur l’équilibre limite. Différents réseaux de fractures peuvent être engendrés en fonc...

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Étude comparée de la fracturation observable sur carottes de forage et obtenue par diagraphie. Application au marbre de Saint-Béat (31)

Cited by 2 publications

References 6 publications

Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Characterization of rock discontinuity openings using acoustic wave amplitude — Application to a metamorphic rock mass

Grouping discontinuities in representative sets: influence on the stability analysis of slope cuts

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