Open pit numerical model calibration using a pseudo three-dimensional radar monitoring technique

Authors: Severin, J; Eberhardt, E; Fortin, S

DOI https://doi.org/10.36487/ACG_rep/1308_42_Severin

Cite As:
Severin, J, Eberhardt, E & Fortin, S 2013, 'Open pit numerical model calibration using a pseudo three-dimensional radar monitoring technique', in PM Dight (ed.), Slope Stability 2013: Proceedings of the 2013 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 639-652, https://doi.org/10.36487/ACG_rep/1308_42_Severin

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Abstract:
Slope monitoring plays an important role in the calibration of numerical models created to investigate the mechanics of large open pit slopes. Geodetic prisms are often relied upon to delineate the boundaries of potential slope hazards; however the data can be limited by its point-measurement nature. Localised displacements at each prism may be misinterpreted when extended to the behaviour of the entire slope, and important displacements between prisms may be overlooked. A novel experiment was conducted in which two ground-based synthetic aperture radar systems were simultaneously deployed to record continuous, line-of-sight displacement of an open pit slope in ‘stereo’. The displacement vectors were combined to create a pseudo 3D displacement map of the pit slope consisting of over 25,000 monitoring points. The data collected demonstrated that an improved understanding of the 3D kinematics of a large rock slope can be achieved using advanced state-of-the-art monitoring techniques to aid mine design. The displacement data as well as the understanding of the slope kinematics were then used to calibrate a numerical model of the current pit slope created using 3DEC, a 3D distinct element modelling code. Rock mass and fault properties were modified until the response observed in the model was more representative to that of the monitoring data throughout the slope face. Rock mass response to mining-induced stress was shown to vary over several different parts of slope, including the areas adjacent to the main faults within the slope.

References:
Brummer, R., Li, H. and Moss, A. (2006) The transition from open pit to underground mining: An unusual slope failure mechanism at Palabora, in Proceedings Stability of Rock Slopes in Open Pit Mining and Civil Engineering Situations, Johannesburg: SAIMM, pp. 411–420.
Day, A.P. and Seery, J.M. (2007) Monitoring of a large wall failure at Tom Price Iron Ore Mine, in Proceedings International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering (Slope Stability 2007), Yves Potvin (ed),
12‒14 September 2007, Perth, Western Australia, Australian Centre for Geomechanics, Perth, pp. 333–340.
Farina, P., Leoni, L., Babboni, F., Coppi, F., Mayer, L., Coli, N. and Thompson, C. (2012) Monitoring Engineered and Natural Slopes by Ground-based Radar: Methodology, Data Processing and Case Studies Review, in Proceedings SHIRMS 2012, SAIMM, p. 10.
Fukuzono, T. (1985) A new method for predicting the failure time of a slope, in Proceedings 4th International, Conference and Field Workshop on Landslides, Tokyo, Tokyo University Press, pp. 145–150.
Harries, N., Noon, D. and Rowley, K. (2006) Case studies of slope stability radar used in open cut mines, in Proceedings Stability of Rock Slopes in Open Pit Mining and Civil Engineering Situations, Johannesburg, SAIMM, pp. 335–342.
Harries, N.J. and Roberts, H. (2007) The use of slope stability radar (SSR) in managing slope instability hazards, in Proceedings Rock Mechanics: Meeting Society’s Challenges and Demands, E. Eberhardt, D. Stead and T. Morrison (eds), 1st Canada–US Rock Mechanics Symposium, 27–31 May 2007, Vancouver, Canada, Taylor & Francis, London, pp. 53–59.
Itasca Consulting Group Inc. (2007) 3DEC version 4.1, 3 Dimensional Distinct Element Code.
Piteau Associates Ltd. (2008) Open Pit Geotechnical Assessments and Preliminary Slope Design Criteria for the Lornex Pit L16 Expansion, Internal Document.
Rödelsperger, S., Läufer, G., Gerstenecker, C. and Becker, M. (2010) Monitoring of displacements with ground-based microwave interferometry: IBIS-S and IBIS-L, Journal of Applied Geodesy Vol. 4(1), pp. 41–54.
Rose, N. and Scholz, M. (2009) Analysis of complex deformation behaviour in large open pit mine slopes using the Universal Distinct Element Code (UDEC), in Proceedings International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering (Slope Stability 2009), Santiago, Chile, 9–11 November 2009, CD-Rom, 11 p.
Severin, J., Eberhardt, E., Leoni, L. and Fortin, S. (2011) Use of Ground-Based Synthetic Aperture Radar to Investigate Complex 3-D Pit Slope Kinematics, in Proceedings International Symposium on Rock Slope Stability in Open Pit Mining and Civil Engineering 2011 (Slope Stability 2011), September 18–21 2011, Vancouver, Canada, USB format.
Tosney, J.R., Milne, D., Chance, A.V. and Amon, F. (2004) Verification of a Large Scale Slope Instability Mechanism at Highland Valley Copper, International Journal of Surface Mining, Reclamation and Environment, Vol. 18, No. 4, pp. 273–288.




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