Geotechnical analysis and ground support selection for the Oyu Tolgoi Crusher Chamber #2

Authors: Sharrock, GB; Ooi, J; Baasanjav, B

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DOI https://doi.org/10.36487/ACG_repo/2205_14

Cite As:
Sharrock, GB, Ooi, J & Baasanjav, B 2022, 'Geotechnical analysis and ground support selection for the Oyu Tolgoi Crusher Chamber #2', in Y Potvin (ed.), Caving 2022: Proceedings of the Fifth International Conference on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 227-240, https://doi.org/10.36487/ACG_repo/2205_14

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Abstract:
Oyu Tolgoi (OT), in the South Gobi region of Mongolia, is one of the largest known copper and gold deposits in the world. At peak production, Oyu Tolgoi is expected to produce 500,000 tonnes per annum of copper.  The Panel 2 (PC2) crusher is a key component of the OT underground ore handling system, which has a total capacity of 95 ktpd; the PC2 crusher processes 45 ktpd of this total. The PC2 crusher chamber is a large excavation located at a depth of 1,300 m, with a stand-off distance of 280 m from the Panel 2 footprint. This paper describes the geomechanical analyses and design carried out to evaluate stability and support of the chamber including:

Keywords: large chamber, deep and high stress mining, ground support, numerical modelling

References:
Bewick, RP 2021, ‘The strength of massive to moderately jointed rock and its application to cave mining’, Journal of Rock Mechanics and Rock Engineering, vol. 54, pp. 3629–3661.
Callahan, MF, Keskimaki, KW & Rech, WD 2000, ‘A case history of the crusher level development at Henderson’, in G Chitombo (ed), Proceedings of MassMin 2000, Australasian Institute of Mining and Metallurgy, Melbourne, pp. 307–316.
Campbell, AD, Lilley, CR, Waters, S & Jones, PA 2013, '’Geotechnical analysis and ground support selection for the Ernest Henry crusher chamber’, in Y Potvin & B Brady (eds), Ground Support 2013: Proceedings of the Seventh International Symposium
on Ground Support in Mining and Underground Construction, Australian Centre for Geomechanics, Perth,
pp. 437–450, doi.org/10.36487/ACG_rep/1304_29_Campbell
Casten, T, Golden, R, Mulyadi, A & Barber, J 2000, ‘Excavation design and ground support of the gyratory crusher installation at the DOZ Mine, PT Freeport Indonesia’, in G Chitombo (ed), Proceedings of MassMin 2000, Australasian Institute of Mining and Metallurgy, Melbourne, pp. 295–299.
Earl, P 2009, Ground Control Scheme Design of the West Crusher Complex at Ridgeway Deeps Block Cave, master’s thesis, Curtin University
Ghazvinian, E, Garza-Cruz, T, Bouzeran, L, Fuenzalida, M, Cheng, Z, Cancino, C & Pierce, M 2020, ‘Theory and Implementation of the Itasca Constitutive Model for Advanced Strain Softening (IMASS)’, in R Castro, F Báez & K, Suzuki (eds), MassMin 2020: Proceedings of the Eight International Conference and Exhibition on Mass Mining, University of Chile, Santiago, pp. 451–461.
Hebert, Y & Sharrock, G 2018, ‘Three-dimensional simulation of cave initiation, propagation and surface subsidence using a coupled finite difference–cellular automata solution’, in Y Potvin & J Jakubec (eds), Caving 2018: Proceedings of the
Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth,
pp. 151–166, doi.org/10.36487/ACG_rep/1815_09_Hebert
Hoek, E 2001, ‘Big tunnels in bad rock - 2000 Terzachi lecture’, ASCE Journal of Geotechnical and Geoenvironmental Engineering,
vol. 127, no. 9, pp. 726–740.
Hoek, E 2007, Practical Rock Engineering, rocscience.com/learning/hoeks-corner/course-notes-books
Hoek E & Brown ET 2019, ‘The Hoek–Brown Failure Criterion and GSI – 2018 edition’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 11, issue 3, pp. 445–463.
Hormazabal, E, Pereira J, Barindelli, G & Alvarez, R 2014, ‘Geomechanical evaluation of large excavations at the New Level Mine
- El Teniente’, in R Castro (ed), Caving 2014: Proceedings of the 3rd International Symposium on Block and Sublevel Caving, University of Chile, Santiago.
Hönisch, K 1988, ‘Rock mass modelling for large underground powerhouses’, in G Swodoba, Numerical Methods in Geomechanics, vol. 3, A.A. Balkema, Rotterdam.
Itasca 2021, FLAC3D (Fast Lagrangian Analysis of Continua), version 7.0, computer software, itascacg.com/software/flac3d, Itasca Consulting Group, Minneapolis.
Kaiser, P, Bewick, R, Amman, F & Pierce, M 2015, Best Practice in Rock Mass Characterization for Brittle Rock Masses (V2), Rio Tinto Centre for Underground Construction at CEMI, confidential Rio Tinto report: 12/2015.
Kaiser, PK, Maloney, SM & Yong, S 2016, ‘Role of large scale heterogeneities on in-situ stress and induced stress fields’, Proceedings of the 50th U. S. Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Alexandria.
Maloney, S, Kaiser, PK, & Vorauer, A 2006, ‘A re-assessment of in situ stresses in the Canadian Shield’, Proceedings of Golden Rocks 2006: The 41st U.S. Symposium on Rock Mechanics, American Rock Mechanics Association, Alexandria
Martin, CD, Kaiser, PK, & Christiansson, R 2003, ‘Stress, instability and design of underground excavations’, International Journal of Rock Mechanics and Mining Sciences, vol. 40, no. 7–8, pp. 1027–1047, doi.org/10.7939/R3H41JM6V
Ooi, J 2021, Preliminary Assessment of Rock Mass Characterisation for Primary Crusher Chamber 2 Complex, document ID: T&IP-OBK-2021-27, confidential Rio Tinto report.
Ooi, J, Watt, G & Grobler, H 2022, ‘Raisebore stability and support at deep depth and highly defected rock mass condition: Oyu Tolgoi case study’, in Y Potvin (ed), Caving 2022: Proceedings of Fifth International Conference on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 885–900.
Pierce, M 2013, ‘Numerical modeling of rock mass weakening, bulking and softening associated with cave mining’, ARMA eNewsletter, spring 2013, issue 9, www.armarocks.org
Player, J, Thompson, AG & Villaescusa, E 2008, ‘Dynamic testing of reinforcement system’, in TR Stacey & D Malan (ed), Proceedings of the 6th International Symposium on Ground Support in Mining and Civil Engineering Construction The South African Institute of Mining and Metallurgy, Johannesburg, pp. 581–595.
Talu, MS & Wilson, AD 2004, ‘Innovative mining method and related support systems and quality assurance for a large underground crusher excavation: De Beers Finsch Mine, South Africa’, Proceedings of Massmin 2004, Instituto de Ingenieros de Chile, Santiago.




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