Raffaldi, MJ, Chambers, DJA & Johnson, JC 2017, 'Numerical study of the relationship between seismic wave parameters and remotely triggered rockburst damage in hard rock tunnels', 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. 373-386, https://doi.org/10.36487/ACG_rep/1704_26_Raffaldi
Rockbursts are a serious hazard to workers in deep and high stress mines. Researchers with the National Institute for Occupational Safety and Health, Spokane Mining Research Division in Spokane, Washington, United States of America are using fully dynamic numerical modelling software to investigate rock fracture, ejection, and ground support demand in underground mine openings resulting from strong ground motion induced by a remote seismic source. In this study, a discrete element model of a typical metal mine drift supported by grouted rockbolts was subjected to seismic loading from a remote source. A parameter study was performed with respect to the ground motion by varying the peak particle velocity and frequency content of the input waveform. For each modelled seismic event, the resulting energy demand on the ground support is calculated. Other parameters — peak particle acceleration, duration, and radiated seismic energy — are considered implicitly. The results of this work provide insight into seismic loading of excavations and ground support and may partially explain why, in some cases, peak particle velocity does not correlate well with observed damage. Better understanding of the effects of seismic loading on excavations may lead to developments that improve the safety of workers in underground mines.
Keywords: dynamic modelling, rockburst, dynamic support, rock dynamics
Bauer, A & Calder, PN 1970, ‘The influence and evaluation of blasting on stability’, in CO Brawner & V Milligan (eds), Proceedings of the 1st International Conference on Stability in Open Pit Mining, American Institute of Mining, Metallurgical, and Petroleum Engineers, New York, pp. 83–94.
Butler, AG & Van Aswegen, G 1993, ‘Ground velocity relationship based on a large sample of underground measurements in two South African mining operations’, in RP Young, RP (ed.), Proceedings of the Third International Symposium on Rockbursts and Seismicity in Mines, CRC Press, pp. 41–51.
Christianson, M 2015, Energy Calculation Modifications in UDEC 6.0, report no. 2-1607-01, prepared by Itasca Consulting Group, for NIOSH Spokane Research Center, Spokane.
Cichowicz, A 1997, Development of A More Reliable Means of Assessing Safety Risk due to Rockbursts and Rockfalls as A Managerial Decision Support Technique, SIMRAC Final Project Report, Safety in Mines Research Advisory Committee, Johannesburg,
Cichowicz, A & Durrheim, RG 1997, ‘The site response of the tunnel sidewall in a deep gold mine, analysis in the time domain’, in Gurtunca, RG & Hagan, TO (eds), Proceedings of the First Southern African Rock Engineering Symposium, pp. 56–61.
Cichowicz A, Milev, AM & Durrheim, RJ 2000, ‘Rock mass behaviour under seismic loading in a deep mine environment: implications for stope support’, Journal of the Southern African Institute of Mining and Metallurgy, vol. 100, no. 2, pp. 121–128.
Damjanac, B, Board, M, Lin, M, Kicker, D & Leem, J 2007, ‘Mechanical degradation of emplacement drifts at Yucca Mountain – A modeling case study Part II: Lithophysal rock’, International Journal of Rock Mechanics and Mining Sciences, vol. 44, pp. 368–399.
Dowding, CH 1985, Blast Vibration Monitoring and Control, Library of Congress, USA.
Dowding, CH & Rosen, A 1978, ‘Damage to rock tunnels from earthquake shaking,’ Journal of the Geotechnical Engineering Division of the American Society of Civil Engineers, vol. 104, pp. 175–191.
Durrheim RJ, Roberts, MKC, Haile, AT, Hagan, TO, Jager, AG, Handley, MF, Spottiswoode, SM & Ortlepp, WD 1998, ‘Factors influencing the severity of rockburst damage in South African gold mines’, Journal of the South African Institute of Mining and Metallurgy, vol. 98, pp. 53–57.
Hedley, DGF 1992, Rockburst Handbook for Ontario Hardrock Mines, Special Report SP92-1E, CANMET, pp. 1–305.
Hendron, AJ 1977, Engineering of Rock Blasting on Civil Projects, Prentice Hall, Englewood Cliffs.
Hendron, AJ & Fernandez G 1983, ‘Dynamic and static design considerations for underground chambers’, Seismic Design of Embankments and Caverns, American Society of Civil Engineers, Reston, pp. 157–197.
Itasca 2015, Universal Distinct Element Code (UDEC v6.0) User Manual, Itasca Consulting Group, Minnesota.
Kaiser, PK & Maloney, M 1997, ‘Scaling laws for the design of rock support’, Pure and Applied Geophysics, vol. 150, pp. 415–434.
Kaiser, PK, Tannant, DD & McCreath, DR 1996, Canadian Rockburst Support Handbook, Geomechanics Research Centre, Laurentian University, Sudbury.
Labreche, DA 1983, ‘Damage mechanisms in tunnels subjected to explosive loads’, Proceedings of Seismic Design of Embankments and Caverns, American Society of Civil Engineers, Reston, pp. 128–140.
Langefors, U & Kihlstrom, B 1963, Rock Blasting, John Wiley and Sons, New York.
Lanzano G, Bilotta, E & Russo, G 2008, ‘Tunnels under seismic loading: a review of damage case histories and protection methods’, in G Fabbrocino & F Santucci de Magistris (eds), Strategy for Reduction of the Seismic Risk, Arti Grafiche La Regione srl, Ripalimosani, pp. 65–74.
McGarr, A 1983, ‘Estimating ground motions for small nearby earthquakes, Proceedings of Seismic Design of Embankments and Caverns, American Society of Civil Engineers, Reston, pp. 113–126.
McGarr, A, Green, RWE & Spottiswoode, SM 1981, ‘Strong ground motion of mine tremors: Some implications for near-source ground motion parameters’, Bulletin of the Seismological Society of America, vol. 71, pp. 295–319.
Milev, AM & Spottiswoode, SM 2005, ‘Strong ground motion and site response in deep South African mines’, Journal of the South African Institute of Mining and Metallurgy, vol. 105, pp. 515–524.
Milev, AM, Spottiswoode, SM & Stewart, RD 1999, ‘Dynamic response of the rock surrounding deep level mining excavations’, Proceedings of the 9th Symposium of the International Society for Rock Mechanics, pp. 1109-1114.
Milev, AM, Spottiswoode, SM, Rorke, AJ & Finnie, GJ 2001, ‘Seismic monitoring of a simulated rockburst on a wall of an underground tunnel’, Journal of the South African Institute of Mining and Metallurgy, vol. 101, pp. 253–260.
Morissette, P, Hadjigeorgiou, J & Thibodeau, D 2012, ‘Validating a support performance database based on passive monitoring data’, in Y Potvin (ed.), Proceedings of the Sixth International Seminar on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 27–40.
Pariseau, WG 2011, Design Analysis in Rock Mechanics, Taylor and Francis, London.
Perret, WR 1972, ‘Seismic source energies of underground nuclear explosions’, Bulletin of the Seismological Society of America, vol. 62, pp. 763–774.
Phillips, JS & Luke, BA 1990, Tunnel Damage Resulting from Seismic Loading, SAND90-1721C, Sandia National Laboratories, Albuquerque, pp. 1–27.
Potvin, Y 2009, ‘Strategies and tactics to control seismic risks in mines’, Journal of the Southern African Institute of Mining and Metallurgy, vol. 109, pp. 177–186.
Raffaldi, MJ & Loken, MC 2016a, ‘Rock mass modeling approach for simulating wave propagation, rock fracture, and rock ejection’, Proceedings of the 50th US Rock Mechanics Symposium, American Rock Mechanics Association, Alexandria, pp. 12.
Raffaldi, MJ & Loken, MC 2016b, ‘Framework for simulating fracture, ejection, and restraint of rock around a mine drift subjected to seismic loading’, Proceedings of the 50th US Rock Mechanics Symposium, American Rock Mechanics Association, Alexandria, pp. 17.
Sharma, S & Judd, WR 1991, ‘Underground opening damage from earthquakes,’ Engineering Geology, vol. 30, pp. 263–276.
Starfield, AM & Cundall, PA 1988, ‘Towards a methodology for rock mechanics modelling’, International Journal of Rock Mechanics and Mining Science & Geomechanics Abstract, vol. 24, pp. 99–106.
Swanson, P, Boltz, MS & Chambers, D 2016, Seismic Monitoring Strategies for Deep Longwall Coal Mines, National Institute for Occupational Safety and Health Report on Investigations, RI 9700, pp. 100.
Wagner, H 1984, ‘Support requirements for rockburst conditions,’ Proceedings of the 1st International Symposium on Rockburst and Seismicity in Mines, South African Institute of Mining and Metallurgy, Johannesburg, pp. 209–218.