Authors: Rogers, SF; Bewick, RP; Brzovic, A; Gaudreau, D

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Rogers, SF, Bewick, RP, Brzovic, A & Gaudreau, D 2017, 'Integrating photogrammetry and discrete fracture network modelling for improved conditional simulation of underground wedge stability', in J Wesseloo (ed.), Deep Mining 2017: Proceedings of the Eighth International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 599-610,

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Over the last decade, the advantages of discrete fracture network (DFN) models over more conventional tools for key block stability analysis have become increasingly apparent. Without their need for a series of simplifying assumptions regarding the fracture system, rock wedge formation and excavation geometry, DFN’s ability to accurately capture the underground rock mass is clear. Coupled with the probabilistic consideration of block formation and joint strength parameters, they provide a valuable tool to the engineer for risk-based underground stability assessments. However, recent changes in DFN technology have allowed a step change in modelling realism to be incorporated. A major improvement is the ability to generate DFN models directly conditioned to photogrammetric surveys so that the kinematic assessment is carried out on a structural description that accurately reflects the scanned location. This conditioned DFN model is embedded within an unconditioned stochastic description of the rock mass away from the scanned rock mass exposure, thus, providing a model that is constrained by the available geotechnical data (boreholes, scanning, trace mapping) but accurately conditioned to the key observed structures. The result is an ability to optimise excavation and ground support designs with a method that intelligently handles the natural heterogeneity imposed by the rock mass, combining what we see with what we know.

Keywords: discrete fracture network (DFN), kinematic stability, photogrammetry

Carvalho, J, Hoek, E & Lee, B 1991, UnWedge: Underground Wedge Analysis, Department of Civil Engineering, University of Toronto, Toronto.
Dershowitz, W & Carvalho, J 1996, ‘Key-block tunnel stability analysis using realistic fracture patterns in rock mechanics tools and techniques’, in M Aubertin (ed.), Proceedings of the 2nd North American Rock Mechanics Symposium: NARMS ‘96, AA Balkema, Rotterdam, pp. 1747–1751.
Dershowitz, W, Lee, G, Geier, J, Foxford, T, LaPointe, P & Thomas, A 1995, FracMan Interactive Discrete Fracture Data Analysis, Geometric Modeling, and Exploration Simulation, User Documentation, version 2.5, report 923–1089, Golder Associates Inc, Seattle.
Dershowitz, W, & Herda, H 1992, ‘Interpretation of fracture spacing and intensity’, in JR Tillerson & W Wawersik (eds), Proceedings of the 33rd U.S. Rock Mechanics Symposium, Balkema, Rotterdam, pp. 757–766.
Efron, B 1979, ‘Bootstrap methods: Another look at the jackknife’, The Annals of Statistics, vol. 7, no. 1, pp. 1–26.
Einstein, H & Glynn, E 1979, ‘Probability of kinematic instability in rock slopes: A numerical approach’, Proceedings of the 20th US Symposium on Rock Mechanics, American Society of Civil Engineers, New York, pp. 317–325.
Elmo, D, Rogers, S, Stead, D & Eberhardt, E 2014, ‘Discrete fracture network approach to characterise rock mass fragmentation and implications for geomechanical upscaling’, Mining Technology, vol. 123, no. 3, pp. 149–161.
Elmouttie, M, Poropat, G, & Krähenbühl, G 2010, ‘Polyhedral modelling of underground excavations’, Computers and Geotechnics, vol. 37, no. 4, pp. 529–535.
Goodman, R, & Shi, G 1985, Block Theory and Its Application to Rock Engineering, Prentice Hall, New York.
Grenon, M & Hadjigeorgiou, J 2003, ‘Drift reinforcement design based on discontinuity network modelling’, International Journal of Rock Mechanics and Mining Sciences, vol. 40, no. 6, pp. 833–845.
Hatzor, Y & Goodman, R 1992, ‘Application of block theory and the critical key block concept to tunneling: Two case histories’, Proceedings of the Conference on Fractured and Jointed Rock Masses, International Society for Rock Mechanics, Lisboa.
Ivars, D, Deisman, N, Pierce, M & Fairhurst, C 2007, ‘The synthetic rock mass approach-A step forward in the characterization of jointed rock masses’, Proceedings of the 11th International Congress On Rock Mechanics, International Society for Rock Mechanics, Lisboa.
LaPointe, P, Cladouhos, T & Folin, S 1999, Calculation of displacements on fractures intersecting canisters induced by earthquakes: Aberg, Beberg and Ceberg examples, technical report, TR-99-03, SKB.
Merrien-Soukatchoff, V, Korini, T & Thoraval, A 2012, ‘Use of an integrated discrete fracture network code for stochastic stability analyses of fractured rock masses’, Rock Mechanics and Rock Engineering, vol. 45, no. 2, pp. 159–181.
Rogers, S & Booth, P 2014, ‘Integrated photogrammetry and DFN modelling for improved rock mass characterisation and engineering design’, Proceedings of the 15th Australasian Tunnelling Conference 2014, The Australasian Institute of Mining and Metallurgy, Carlton South, pp. 203–208.
Rogers, S, Chorley, D, Pesendorfer, M, Zawadski, W & Greer, S 2009, ‘Hydrogeological characterisation & conceptual DFN flow modelling of slope pressures within the Diavik diamond mine, NWT’, in J Read (ed.), Proceedings of the International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering, University of the Andes, Santiago.
Rogers, S, Moffitt, K & Kennard, D 2006, ‘Probabilistic tunnel and slope block stability using realistic fracture network models’, in DP Yale (ed.), Proceedings of the 41st US Rock Mechanics Symposium, American Rock Mechanics Association, Alexandria.
Wang, X 2006, Stereological Interpretation of Rock Fracture Traces on Borehole Walls and Other Cylindrical Surfaces, PhD thesis, Virginia Polytechnic Institute and State University, Blacksburg.
Zhang, L, Einstein, H & Dershowitz, W 2002, ‘Stereological relationship between trace length and size distribution of elliptical discontinuities’, Géotechnique, vol. 52, no. 6, pp. 419–433.

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