Authors: Lowther, R; De Ross, J; Orrego, C; Cuello, D

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DOI https://doi.org/10.36487/ACG_repo/2205_15

Cite As:
Lowther, R, De Ross, J, Orrego, C & Cuello, D 2022, 'A probabilistic evaluation of the displacement-based ground support design approach', in Y Potvin (ed.), Caving 2022: Fifth International Conference on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 241-254, https://doi.org/10.36487/ACG_repo/2205_15

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Abstract:
This paper describes the use of Monte Carlo simulations to perform a probabilistic evaluation of the displacement-based dynamic ground support design methodology used to determine the dynamic ground support requirements for hard rock and brittle behaviour in a high stress environment such as Cadia East. The design approach uses several probabilistic inputs including stress level, depth of strainbursting, bulking time, pre-existing bolt head displacement, rock mass bulking, and peak ground velocity. The main mechanism under consideration is the dynamically loaded strainburst where a remote seismic event triggers a strainburst at an excavation. Several of the inputs are represented as probabilistic distributions to capture the variability and uncertainties within each parameter. The outputs are represented as probabilities of having Factor of Safety less than one for the specific support designs assessed. The methodology defines the acceptance criteria of a given ground support profile based on the layers of protection assessment. An example is detailed where three dynamic ground support systems are assessed for an undercut drill drive using the method.

Keywords: probabilistic, displacement-based, dynamic ground support, layers of protection assessment

References:
Cadia Excavation Management TARP 2018, Underground Excavation Management for Geotechnical Engineers 730-200-GE-STR-0007, Newcrest internal document.
Dowell, AM 1997, ‘Layer of protection analysis: a new PHA tool, after HAZOP, before fault tree analysis’, International Conference and Workshop on Risk Analysis in Process Safety, presentation.
DSI 2017, DSI underground product offering for Newcrest Cadia Valley Operations, Newcrest internal document.
Kaiser, PK 2020 a, Newcrest Support Design Handbook 200712, Newcrest internal consultant report from GeoK Inc.
Kaiser, PK 2020b, Dynamic Support System Design (DSSD) Tool, Microsoft Excel calculator developed for Newcrest.
Kaiser, PK & Moss, A 2022, Deformation-based support design for highly stressed ground with a focus on rockburst damage mitigation’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 14, no. 1, pp. 50–66.
Kaiser, PK & Malovichko, D 2022, ‘Energy and Displacement Demands Imposed on Rock Support by Strainburst Damage Mechanisms’, RASIM10, Society for Mining, Metallurgy & Exploration, Tucson.
Kaiser, PK, Tannant, DD & McCreath, DR 1996, Canadian Rockburst Support Handbook, Geomechanics Research Centre, Laurentian University, Sudbury.
Kusui, A 2021, Results from Dynamic Testing of 15.2 mm and 17.8 mm Diameter Cable Bolt Reinforcement Systems 730-200-GE-MEM-0066, Newcrest internal memorandum.
Lowther, R 2017, Strategy for geotechnical control of near-field mine excavations at Cadia East post 14th April 2017 Seismic Event, Newcrest internal memorandum.
Malovichko, D & Kaiser, PK 2020 ‘Dynamic model for seismic shakedown analysis’, Proceedings of the 54th US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Alexandria.
Mendecki, A 2021, Simple GMPE for Cadia East Mine, Newcrest internal consulting report from IMS.
Morissette, P, Hadjigeorgiou, J & Thibodeau, D 2011 ‘Assessment of support performance under dynamic loads at Vale Creighton Mine’, Proceedings of the 45th US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Alexandria.
Morissette, P, Hadjigeorgiou, J & Thibodeau, D 2012, 'Validating a support performance database based on passive monitoring data', in Y Potvin (ed.), Deep Mining 2012: Proceedings of the Sixth International Seminar on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 27–39,
Moss, A & Kaiser, PK 2022, ‘An operational approach to ground control in deep mines’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 14, no. 1, pp. 67–81.




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