Methodology for design risk assessment in burst-prone mines: A case study

CIM Journal, Vol. 5, No. 2, 2014

D. J. Cheung
Nyrstar Myra Falls, Campbell River, British Columbia, Canada

V. N. Kazakidis
Laurentian University, Sudbury, Ontario, Canada

Abstract Seismicity and rockburst problems in hard-rock mines negatively impact safety and profitability. The authors propose a design risk methodology as a relative risk assessment for underground excavations vulnerable to rockburst damage. It considers rock mass conditions relating to mininginduced stress, geological structure, rock mass properties, and mining influence. Application of the methodology to rockburst cases involving seismically active fault zones at the Craig mine in Sudbury, Ontario, Canada, demonstrates that design changes can reduce exposure and economic risks. Mines with high geotechnical risk can use the design risk methodology to evaluate design alternatives as a risk management strategy.
Keywords: Design risk methodology, Burst-prone mines, Rockburst, Craig mine, Bursting hazard,
Incident consequence, Design risk, Mining method
Résumé Les problèmes de sismicité et de coups de toit dans les mines de roches dures ont un impact négatif sur la sécurité et la rentabilité. Nous proposons une méthode de calcul du risque en tant qu’évaluation relative du risque pour les excavations souterraines vulnérables aux coups de toit. Elle tient compte des conditions de la masse rocheuse en ce qui a trait aux contraintes causées par l’exploitation, la structure géologique, les propriétés de la masse rocheuse et l’influence de l’exploitation. L’application de la méthode aux cas de coups de toit impliquant des zones de failles sismiquement actives à la mine Craig à Sudbury, Ontario, Canada, démontre que les changements dans la conception peuvent réduire l’exposition et les risques économiques. Les mines à risque géotechnique élevé peuvent utiliser la méthode de calcul du risque afin d’évaluer les diverses options de conception en tant que stratégie de gestion du risque.
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