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Rockfall Engineering (2011) 1-38

Geophysical detection and structural characterization of discontinuities in rock slopes

Jacques Deparis 1, Denis Jongmans 2, Stéphane Garambois 2, Clara Levy 2, Laurent Baillet 2, Ombeline Meric 3

ISTERRE Collaboration(s)

(08/2011)

The stability of a potentially unstable rock mass strongly depends on the discontinuity pattern and the face topography. Basic geological analysis could provide useful structural information but suffers from the lack of information on discontinuities at depth. Of major importance is the persistence of discontinuities inside the mass. Several geophysical methods (seismic, electric and electromagnetic) are available to address this problem, differing in sensitivity, resolution and depth penetration. The purpose of the chapter is to present the common structural and geophysical methods for characterizing the rock mass. Section 2 is dedicated to a review of the main geophysical parameters and the properties of the main geophysical methods, as well as their possibilities and limitations for discontinuity detection and characterization. In section 3, applications of the aforementioned methods are shown for three limestone cliff sites located around Grenoble (French Alps), exhibiting different geometrical and geotechnical features.

1 :	Bureau de recherches géologiques et minières (BRGM)
	Bureau de Recherches Géologiques et Minières (BRGM)
2 :	Institut des sciences de la Terre (ISTerre)
	CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219
3 :	Société Alpine de Géotechnique
	-

Équipe de recherche : Risques

Domaine

:

Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux

Mots Clés : GPR – seismic – electrical tomography – Rockfall

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Contributeur : Jacques Deparis <>

Soumis le : Vendredi 27 Janvier 2012, 21:07:44

Dernière modification le : Mardi 6 Mars 2012, 15:24:05