Towards an Integrated Field Mapping-Numerical Modelling Approach for Characterising Discontinuity Persistence and Intact Rock Bridges in Large Open Pits

Z. Tuckey, D. Stead, M. Havaej, F. Gao, M. Sturzenegger

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: M3B - Engineering Geology

ABSTRACT: Four major rock slopes were investigated using modified geotechnical survey methods to help improve characterisation of discontinuity persistence and intact rock bridges. Field observations and digital mapping results form the basis for a conceptual numerical modelling study, where distinct element and lattice-spring codes were used to investigate the influence of intact rock bridge content on slope behaviour. Preliminary results suggest that in addition to increasing shear strength along potential failure surfaces, intact rock bridge content can also influence the internal strength and deformability of potential slide volumes. Based on field observations and modelling results, the authors make preliminary recommendations for improving characterisation of discontinuity persistence and intact rock bridges in rock slopes. The authors emphasize the need for a flexible methodology, which can be adapted according to site-specific factors including geology, slope size, blast-induced damage, and the mapping tools available to the practitioner.

RÉSUMÉ: caractérisation de la persistance des discontinuités et des ns de terrain et de caractérisation digitale sont incorporés dans des modèles numériques conceptuels aux éléments finis et de type « lattice-spring mportement des pentes rocheuses. Des résultats préliminaires démontrent que non seulement les ponts rocheux augmentent la résistance au glissement le long ils ont aussi un effet sur la résistance interne et la déformabilité de volumes de roche instables. Sur la base des observations de terrain et de la modélisation numériques, les auteurs fournissent des recommandations préliminaires pour améliorer la caractérisation de la persistance des discontinuités et des ponts rocheux. Les auteurs insistent sur le besoin de méthodes flexibles, qui peuvent être adaptées selon des facteurs

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