Elmouttie, MK, Poropat, GV, Krähenbühl, G & Dean, P 2013, 'Rapid characterisation of potentially hazardous blocks in open pit mining', in PM Dight (ed.), Proceedings of the 2013 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering
, Australian Centre for Geomechanics, Perth, pp. 151-162, https://doi.org/10.36487/ACG_rep/1308_04_Elmouttie
The management of open pit mine slope stability analysis can be optimised by using all available data ranging from qualitative assessment of rock mass properties through to the results of sophisticated computer-based analyses. The choice of approach is typically based on both technical and resource constraints. In this paper we propose a practical method to manage design risks by understanding the potential structure-controlled failure mechanisms of a slope. In particular we emphasise that an understanding of the trustworthiness or level of confidence associated with the stability analysis is essential to manage the rock mass and to determine the appropriate amount of resources required.
The example discussed in this paper involves consideration of the potential formation of kinematically hazardous blocks on a mine highwall or bench face, where it is not clear from the outset what approach is required. The proposed method provides a quick assessment based on the spatial location of structure data and the practical uncertainties resulting from variation of key input data. In this paper, we will present new methods to provide this guidance based on recent advances in the use of digitally mapped structural data, first pass rigid block stability analysis and analysis of the confidence of the stability analysis undertaken.
Baecher, G.B., Lanney, N.A. and Einstein, H.H. (1978) Statistical description of rock properties and sampling, in Proceedings 18th U.S. Symposium on Rock Mechanics, 22–24 June 1977, Keystone, USA, Johnson Publisher, Golden, USA.
Billaux, D., Chiles, J.P., Hestir, K. and Long, J.C.S. (1989) Three dimensional statistical modelling of a fractured rock mass – an example from the Fanay-Augeres Mine, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Elsevier, Vol. 26(3/4), pp. 281–299.
Carver, S. (1991) Integrating multi-criteria evaluation with geographic information systems, International Journal of Geographical Information Systems, Taylor & Francis, Vol. 5, pp. 321–339.
Dershowitz, W.S. (1984) Rock joint systems, PhD Thesis, Massachusetts Institute of Technology, Boston, USA.
Elmouttie, M., Poropat, G.P. and Guest, A. (2008) On the need for polyhedral representation of blocky rock masses, in Proceedings First Southern Hemisphere International Rock Mechanics Symposium (SHIRMS), Y. Potvin, J. Carter, A. Dyskin and R. Jeffrey (eds), Vol. 2 – Fundamental and Petroleum, 16–19 September 2008, Perth, Australia, Australian Centre for Geomechanics, Perth, pp. 433–446.
Elmouttie, M., Poropat, G. and Hamman, E.C.F. (2009) Simulations of the sensitivity of rock structure models to field mapped parameters, in Proceedings International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering (Slope Stability 2009), 9–11 November 2009, Santiago, Chile, CD-rom only.
Elmouttie, M., Poropat, G. and Krahenbuhl, G. (2010) Polyhedral modeling of rock mass structure International Journal of Rock Mechanics and Mining Sciences & Geomechanics, Elsevier, Vol. 47(4), pp. 544–552.
Elmouttie, M.K. and Poropat, G.V. (2011) Uncertainty propagation in structural modelling, in Proceedings International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering (Slope Stability 2011), 18–21 September 2011, Vancouver, Canada, Canadian Rock Mechanics Association, Canada, CD-rom only.
Elmouttie, M.K., Krähenbuhl, G., Poropat, G.V. and Kelso, I. (2013) Stochastic representation of sedimentary geology, Rock Mechanics and Rock Engineering,
, Springer Verlag.
Jing, L. and Stephansson, O. (1994) Topological identification of block assemblages for jointed rock masses, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Elsevier, Vol. 31, pp. 163–172.
Jing, L. (2000) Block system construction for three dimensional discrete element models of fractured rocks, International Journal of Rock Mechanics and Mining Sciences & Geomechanics, Elsevier, Vol. 37, pp. 645–659.
Jing, L. (2003) A review of techniques, advances and outstanding issues in numerical modelling for rock mechanics and rock engineering, International Journal of Rock Mechanics & Mining Sciences, Elsevier, Vol. 40, pp. 283–353.
Lin, D., Fairhurst, C. and Starfield, A.M. (1987) Geometrical identification of three dimensional rock block systems using topological techniques, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Elsevier, Vol. 24(6), pp. 331–338.
Lu, J. (2002) Systematic identification of polyhedral rock blocks with arbitrary joints and faults, Computers and Geotechnics, Elsevier, Vol. 29, pp. 49–72.
Menéndez-Díaz, A., González-Palacio, C., Álvarez-Vigil, A.E., González-Nicieza, C. and Ramírez-Oyanguren, P. (2009) Analysis of tetrahedral and pentahedral key blocks in underground excavations, Computers and Geotechnics, Elsevier, Vol. 36, pp. 1009–1023.
Malczewski, J. (1991) GIS and Multicriteria Decision Analysis, John Wiley & Sons, 393 p.
Rogers, S.F., Kennard, D.K., Dershowitz, W.S. and Van As, A. (2007) Characterising the in situ fragmentation of a fractured rock mass using a discrete fracture network approach, in Proceedings Rock Mechanics: Meeting Society’s Challenges and demands, E. Eberhardt, D. Stead, T. Morrison (eds), 1st Canada-US Rock Mechanics Symposium, 27–31 May 2007, Vancouver, Canada, Taylor & Francis Group, London.
Stead, D., Eberhardt, E. and Coggan, J.S. (2006) Developments in the characterisation of complex rock slope deformation and failure using numerical modelling techniques, Engineering Geology, Elsevier, Vol. 83, pp. 217–235.
Wang, L.G., Yamashita, S., Sugimoto, F., Pan, C. and Tan, G. (2003) A Methodology for Predicting the In Situ Size and Shape Distribution of Rock Blocks, Rock Mechanics and Rock Engineering, Springer, Vol. 36(2), pp. 121–142.