Global characterization of high rock slopes using the hoek-brown mb parameter as controlling index

T. G. Carter, C. Carranza-Torres

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

One of the most iconic graphs in rock engineering is the slope height versus slope angle chart (Lutton 1970; Hoek & Bray 1981). Many large open pits and high rock cuts have been designed with this chart providing geometrical benchmarking. However, it has long been recognized that the limit lines that have been traditionally drawn on these types of charts are flawed with respect to prediction of maximum credible slope heights for high competence rock masses. A new empirically-based chart, which largely addresses this restriction was proposed at the 2018 Large Open Pit Symposium in Sevilla, Spain (Carter 2018). To achieve better matching to the complete spectrum of precedent high natural and man-made slopes, this new chart was formulated using the Hoek-Brown mb parameter as a measure for subdividing the data into a family of Jaeger- style U-shaped critical angle curves, rather than the more usual negative exponential. This paper explores the shape of the mb-trendlines established in the empirical chart in Carter (2018) and introduces a theoretically based suite of slope height versus slope angle analytical curves calibrated to the data presented earlier on. It is hoped that this new set of curves will assist for better slope benchmarking.

Original languageEnglish (US)
Title of host publicationRock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
EditorsSergio A.B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza
PublisherCRC Press/Balkema
Pages3465-3481
Number of pages17
ISBN (Print)9780367422844
StatePublished - 2020
Event14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019 - Foz do Iguaçu, Brazil
Duration: Sep 13 2019Sep 18 2019

Publication series

NameRock Mechanics for Natural Resources and Infrastructure Development- Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019

Conference

Conference14th International Congress on Rock Mechanics and Rock Engineering, ISRM 2019
CountryBrazil
CityFoz do Iguaçu
Period9/13/199/18/19

Bibliographical note

Publisher Copyright:
© 2020 ISRM.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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