Quantifying losses in support capacity due to corrosion

CIM Journal, Vol. 6, No. 3, 2015, pages 149-156

J.-F. Dorion
Langlois mine, Nyrstar, Quebec, Canada

J. Hadjigeorgiou
Lassonde Institute of Mining, University of Toronto, Toronto, Ontario, Canada

E. Ghali
Université Laval, Québec City, Quebec, Canada

http://dx.doi.org/10.15834/cimj.2015.16
Abstract Corrosion of support system components (e.g., bolts, mesh, plates) is a safety and economic concern in underground mines. This paper reports the results of a five-year study wherein corrosion coupons were installed at select locations in participating mines, recovered at regular intervals, analyzed for signs of corrosion, and tested to quantify loss in capacity. Complementary tests were conducted on recovered mesh and friction bolt specimens. The data provide insights into contributing factors for support systems corrosion, which aid in the selection of appropriate support strategies and reliable assessment of the useful life and need for rehabilitation of a support system.
Keywords: Corrosion, Reinforcement systems, Support systems, Underground mines
Résumé La corrosion des composantes des systèmes de soutien (p. ex. boulons, grillages et plaques) est une préoccupation économique et de sécurité dans les mines souterraines. Cet article présente les résultats d’une étude de cinq ans pendant laquelle des coupons de corrosion ont été installés à des endroits spécifiques dans les mines participantes; ces coupons ont été retirés à des intervalles réguliers, analysés pour des signes de corrosion et mis à l’épreuve pour quantifier la perte de capacité. Des essais complémentaires ont été effectués sur les grillages récupérés et sur les échantillons de boulons d’ancrage. Les données aident à comprendre les facteurs qui contribuent à la corrosion des systèmes de soutien, ce qui est utile dans le choix de stratégies appropriées de soutien et pour une évaluation fiable de la durée de vie utile et du besoin de remise en état d’un système de soutien.
Mots-Clé Corrosion, mines souterraines, systèmes de renforcement, systèmes de soutien
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