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Design of large cuttings in jointed rock

Abstract

The article presents a stability study on a very high cutting in a granitic gneiss, as part of the construction of a bypass in the French Pyrenees. The preliminary study highlighted questions as to the most appropriate method of designing the rock cuts, as such methods are not standardized in France. A temporary stop in the roadworks allowed a second study to be carried out based on a statistical analysis of the discontinuities of the site and better-developed modeling tools, including Resoblok. A comparative analysis of these methods and their results in terms of bolt sizing is presented, taking into account the difficulty of use of each method.

Résumé

l’article présente une étude de stabilité réalisée sur des déblais de grande hauteur en cours de réalisation dans un massif gneissique, pour la création d’une déviation dans les Pyrénées françaises. Dans un premier temps, l’étude préalable au chantier à conduit les géotechniciens à s’interroger sur les méthodes de dimensionnement de tels talus rocheux, méthodes non normées à l’heure actuelle. Dans un second temps, et grâce à l’arrêt temporaire du dit chantier, une seconde étude a été réalisée en se basant sur une analyse statistique plus fine des discontinuités du site et sur des moyens de modélisation plus développés. Une analyse comparée de ces méthodes et de leurs résultats en terme de dimensionnement du clouage est proposée, tout en tenant compte de leurs lourdeurs respectives.

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Acknowledgments

The authors are very grateful to V. Merrien-Soukatchoff who let them use Resoblok and helped them throughout.

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Correspondence to M. Gasc-Barbier.

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Gasc-Barbier, M., Ballion, A. & Virely, D. Design of large cuttings in jointed rock. Bull Eng Geol Environ 67, 227–235 (2008). https://doi.org/10.1007/s10064-008-0127-4

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Keywords

  • Discontinuity
  • Rock mass stability
  • Bolting
  • Design
  • Structural model

Mots clés

  • Discontinuités
  • Stabilité de parois rocheuses
  • Boulonnage
  • Dimensionnement
  • Modélisation structurale