Authors: Medinac, F; Esmaeili, K

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Medinac, F & Esmaeili, K 2020, 'Integrating unmanned aerial vehicle photogrammetry in design compliance audits and structural modelling of pit walls', in PM Dight (ed.), Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 1439-1454,

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Existing field data collection methods for pit slope assessment are manual, time consuming, and can expose technical manpower in hazardous conditions. Advances in unmanned aerial vehicles (UAVs) technology allows collecting photogrammetry data of pit slopes. This aerial approach is fast, on demand and can improve the spatial and temporal resolution of the collected data. The collected data can be used to generate digital elevation models (DEMs) and point clouds to assess the bench face angle and catch benches. Furthermore, virtual mapping can be used to collect detailed structural data. This study presents the application of UAV technology to collect data at a pit wall, in Nevada, USA. A DEM is generated to conduct a design compliance audit of the pit slope. The aerial photogrammetry data is used to generate a point cloud of the slope for virtual structural mapping. The structural mapping data is integrated with the surveyed pit slope geometry to generate a conditioned discrete fracture network (DFN) model. The discontinuities mapped on the slope surface are replicated in the DFN model, while behind the wall, a constrained stochastic model is used to describe the structural complexity of the rock mass. This combined deterministic-stochastic DFN model is used to conduct a kinematic stability analysis of the pit slope. The results are compared to the field observations of slope failure.

Keywords: UAVs, conditioned DFN, structural mapping, design compliance, open pit

Agisoft Metashape 2018, version 1.5.5, computer software, Agisoft LLC, St. Petersburg,
Brady, BHG & Brown, ET 2004, Rock Mechanics for underground mining: Third edition, Springer Netherlands, Dordrecht.
Catalan, A & Onederra, I 2016, ‘Implementation of leading practice in geotechnical and blasting performance evaluations at the Centinela sulphide mine’, Mining Technology, vol. 125, no. 3, pp. 156–173,
CloudCompare 2019, version 2.10.2 Zephyrus, computer software, GPL software,
Derron, MH & Jaboyedoff, M 2010, ‘LIDAR and DEM techniques for landslides monitoring and characterization’, Natural Hazards and Earth System Sciences, vol. 10, pp. 1877–1879,
Eivazy, H, Esmaeili, K & Jean, R 2017, ‘Modelling Geomechanical Heterogeneity of Rock Masses Using Direct and Indirect Geostatistical Conditional Simulation Methods’, Rock Mechanics and Rock Engineering, vol. 50, no. 12, pp. 3175–3195,
Elmo, D, Stead, D & Rogers, S 2015, ‘Guidelines for the Quantitative Description of Discontinuities for use in Discrete Fracture Network Modelling’, 13th ISRM International Congress of Rock Mechanics, International Society for Rock Mechanics and Rock Engineering, Lisbon.
Francioni, M, Salvini, R, Stead, D, Giovannini, R, Riccucci, S, Vanneschi, C & Gullì, D 2015, ‘An integrated remote sensing-GIS approach for the analysis of an open pit in the Carrara marble district, Italy: Slope stability assessment through kinematic and numerical methods’, Computers and Geotechnics, vol. 67, pp. 46–63,
Golder Associates Ltd 2018, FracMan® User’s Manual Release 7.7,
Goodman, R & Shi, G 1985, Block Theory and Its Application to Rock Engineering, Prentice-Hall, Inc., Englewood Cliffs.
Kasser, M & Egels, Y 2002, Digital Photogrammetry, Taylor & Francis, London.
Langford, M, Fox, A & Sawdon Smith, R 2010, ‘Using different focal length lenses, camera kits’, in M Langford, A Fox & R Sawdon Smith (eds), Langford’s Basic Photography (Ninth Edition), Focal Press, Kidlington.
Priest, SD & Hudson, JA 1976, ‘Discontinuity spacings in rock’, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol. 13, no. 5, pp. 135–148.
Read, J & Stacey, P (eds) 2009, Guidelines for Open Pit Slope Design, CSIRO Publishing, Melbourne.
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.), Proceedings of the Eighth International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 599–610.
Szeliski, R 2011, Computer Vision, Springer London, London,
Thiele, ST, Micklethwaite, S, Bourke, P, Verrall, M & Kovesi, P 2015, ‘Insights into the mechanics of en-échelon sigmoidal vein formation using ultra-high resolution photogrammetry and computed tomography’, Journal of Structural Geology, vol. 77, pp. 27–44,
Thiele, ST, Grose, L, Samsu, A, Micklethwaite, S, Vollgger, SA & Cruden, AR 2017, ‘Rapid, semi-automatic fracture and contact mapping for point clouds, images and geophysical data’, Solid Earth, vol. 8, no. 6, pp. 1241–1253,
Tonon, F 2007, ‘Determining fracture size probability distribution functions from trace length probability distribution functions’, Proceedings of the 11th Congress of the International Society for Rock Mechanics, International Society for Rock Mechanics and Rock Engineering, Lisbon, pp. 215–222.
Zhang, L, Einstein, HH & Dershowitz, WS 2002, ‘Stereological relationship between trace length and size distribution of elliptical discontinuities’, Géotechnique, vol. 52, no. 6, pp. 419–433,

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