Authors: Karami, A; Greer, S; Beddoes, R


DOI https://doi.org/10.36487/ACG_repo/708_17

Cite As:
Karami, A, Greer, S & Beddoes, R 2007, 'Numerical Assessment of Step-Path Failures of Northwest Wall of A154 Pit, Diavik Diamond Mines', in Y Potvin (ed.), Slope Stability 2007: Proceedings of the 2007 International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 293-305, https://doi.org/10.36487/ACG_repo/708_17

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Abstract:
The presence of intact rock bridges in the rock mass and their effect on the formation of step-path failure surface in pit slopes have been the subject of research in the last three decades beginning with the work of Jennings (1970). Step-path failure mechanism has been investigated more recently by rock mechanics engineers and consultants using advanced discontinuum numerical techniques. This paper reviews briefly the state of current application of step-path failure in practice and presents the results of one such investigation into the stability assessment of the northwest wall of A154 pit of Diavik Diamond Mine in Northwest Territories, Canada. Results of the numerical assessment are compared with those of limit equilibrium assessment and the importance of such investigations in practice, in particular in deep open pit mines where high stress conditions near the slope toe is present are discussed.

References:
Call, R.D. and Nicholas, D.E. (1978) Prediction of step path failure Geometry for slope stability analysis. Proc. 19th US
Symposium Rock Mechanics.
Dawson, E.M., Motamed, F., Nesarajah, S. and Roth, W.H. (2000) Geotechnical stability analysis by strength reduction.
ASCE Geotechnical Special Publication, Vol. 101, pp. 99-113.
Dawson, E.M., Roth, W.H., Drescher, A. (1999) Slope stability analysis by strength reduction. Geotechnique, Vol. 49,
No. 6, pp. 835-840.
Dershowitz, W., Lee, G., Geier, J. and La Pointe, P.R. (1998) FracMan: Interactive discrete feature data analysis,
geometric modeling and exploration simulation, User Documentation. Golder Associates Inc. Seattle.
Washington.
Duncan, J.M. (1996) State of the art: limit equilibrium and finite-element analysis of slopes. Journal of Geotechnical
Engineering, Vol. 122, No. 7, pp. 577-596.
Eberhardt, E., Stead, D., Coggan, J.S. and Willenberg, H. (2003) Hybrid finite-/discrete-element modeling of
progressive failure in massive rock slopes. ISRM 2003 – Technology roadmap for rock mechanics, South
African Institute of Mining and Metallurgy, pp. 275-280.
Eberhardt, E., Stead, D., Karami, A. and Coggan, J.S. (2004) Numerical Analysis of brittle fracture propagation and
step-path failure in massive rock slopes. Annual Canadian Geotech Conf. Quebec City. 8 p.
Itasca Ltd (2004) FLAC/FLAC3D, UDEC/3DEC User Manuals, Itasca Consulting Ltd.
Numerical Assessment of Step-Path Failure of Northwest Wall of A154 Pit, Diavik Diamond Mines A. Karami, et al.
304 Slope Stability 2007, Perth, Australia
Jennings, J.E. (1970) A mathematical theory for the calculation of the stability of slopes in open cast mines.
Proceedings Planning of Open Pit Mines, Johannesburg, pp. 87-102.
Kemeny, J. (2005) Time-dependent drift degradation due to the progressive failure of rock bridges along
discontinuities. International Journal of Rock Mechanics & Mining Sciences, 42, pp. 35-46.
Liu, J., Feng, X.T., Ding, X.L., Zhang, J. and Yue, D.M. (2003) Stability assessment of the Three-Gorges Dam
foundation, China, using physical and numerical modelling – Part I: physical model tests. International Journal
of Rock Mechanics & Mining Sciences, 40, pp. 609-631.
McDonald, M.G. and Harbaugh, A.W. (1988) A modular three-dimensional finite difference groundwater flow model.
Techniques of Water-Resources Investigations, 06-A1, U.S. Geological Survey, 528 p.
Moffitt, K., Rogers, S. and Greer, S. (2007) Improved assessment of pit slope stability through the use of realistic
fracture network modelling and numerical simulation at the Diavik Diamond Mine. 1st Canada – US Rock
Mechanics Conference, May 27-June 1, 2007, Vancouver.
Ristau, J.M. (1994) Field verification of a step-path simulation model for rock slope stability analysis, Master’s thesis,
University of Idaho, Moscow, ID.
Rockfield Software (2005) Rockfield Ltd., Swansea, UK.
Rocscience (2005) Rocscience Inc., Ontario, Canada.
Stead, D., Yan, M., Elmo, D. and Coggan, J. (2006a) New developments in rock slope engineering: Implications for
open pit slope design Sea To Sky Geotechnique 2006, 59th Canadian Geotechnical Conference, October 1-4,
2006, pp. 1054-1061.
Stead, D., Eberhardt, E. and Coggan, J.S. (2006b) Developments in the characterisation of complex rock slope
deformation and failure using numerical modelling techniques. Engineering Geology, 83 (2006), pp. 217-235.
Yan, M., Elmo, D. and Stead, D. (2007a) Characterisation of step-path failure mechanisms; A combined field based-
numerical modelling study. 1st Canada – US Rock Mechanics Conference, May 27-June 1, 2007, Vancouver.
Yan, M., Stead, D. and Sturzenegger, M. (2007b) Step-path characterisation in rock slopes: An integrated digital
imaging – numerical modelling approach. ISRM 2007, 11th Congress of the International Society of Rock
Mechanics, July 9-13, 2007, Lisbon, Portugal.
Numerical Modelling of Rock Slope
Slope Stability 2007, Perth, Australia 305




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