Morkel, IG & Rossi-Rivera, P 2017, 'The implementation and quantification of the Vallejos and McKinnon re-entry methodology', 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. 173-181, https://doi.org/10.36487/ACG_rep/1704_10_Morkel
The occurrence of seismicity in high stress hard rock mines poses a challenge to geotechnical engineers and mine management around the world. Only a few practical options are available when the mitigation of seismic risk is considered. One of the most widely used options is the implementation of a reentry protocol. These protocols are useful at limiting personnel exposure to elevated seismic hazard associated with the occurrence of a firing. There are several methodologies available for determining an appropriate reentry time. The success rate of these methods varies between sites.
Recent work by Vallejos and McKinnon (2010) suggest a new approach to the reentry problem. They provide methodology that could be implemented on any mine site with a seismic system. The method evaluates the current response in terms of the statistical properties of the rock mass based on historic responses. Discussions on the practical implementation of the method on a site-wide basis were limited, and did not provide an indication of what could quantitatively be expected from the method.
The Vallejos and McKinnon method could be automated and practically implemented on most mine sites with a comprehensive seismic data record. It was shown the methodology, in some cases, may be an improvement on the widely used ‘blanket’ rule implemented on many mine sites.
Keywords: seismic re-entry, seismic risk, mine seismology
Anderson, TW & Darling, DA 1954, ‘A test of goodness of fit’, Journal of the American Statistical Association, vol. 49, no. 268,
Harris, PC & Wesseloo, J 2015, mXrap, version 5, Australian Centre for Geomechanics, Perth, www.mXrap.com
Hudyma, M 2008, Analysis and Interpretation of Clusters of Seismic Events in Mines, PhD thesis, The University of Western Australia, Perth.
Mendecki, A ‘Forecasting seismic hazard in mines’, in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), Proceedings of the 1st Southern Hemisphere International Rock Mechanics Symposium, 16—19 September 2008, Perth, Australian Centre for Geomechanics, Perth, pp. 55—69.
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.
Utsu, T 1961, ‘A statistical study on the occurrence of aftershocks’, Geophysical Magazine, vol. 30, no. 4, pp. 521—605.
Vallejos, JA & McKinnon, SD 2010, ‘Temporal evolution of aftershock sequences for re-entry protocol development in seismically active mines’, in M Van Sint Jan & Y Potvin (eds), Proceedings of the Fifth International Seminar on Deep and High Stress Mining, 6–8 October 2010, Santiago, Australian Centre for Geomechanics, Perth, pp. 199–214.
Woodward, K, Morkel, IG & Wesseloo, J 2015, mXrap Software App, Mining Induced Seismicity - Omori Analysis Tools, version 1, Australian Centre for Geomechanics, Perth, www.mXrap.com
Woodward, K, Wesseloo, J & Potvin, Y 2017, ‘The spatial and temporal assessment of clustered and time-dependent seismic responses to mining’, in J Wesseloo (ed.), Proceedings of the Eighth International Conference on Deep and High Stress Mining, 28–30 March 2017, Perth, Australian Centre for Geomechanics, Perth, in press.