Long-term monitoring of electrically connected rockbolts in different corrosive environments

Authors: Stazick, C; Sweet, D

DOI https://doi.org/10.36487/ACG_repo/2625_36

Cite As:
Stazick, C & Sweet, D 2026, 'Long-term monitoring of electrically connected rockbolts in different corrosive environments', in D Cumming-Potvin & J Wesseloo (eds), Ground Support 2026: Proceedings of the 11th International Conference on Ground Support in Mining, Australian Centre for Geomechanics, Perth, pp. 1-11, https://doi.org/10.36487/ACG_repo/2625_36

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Abstract:
Corrosion of metallic ground support can vary widely within different areas of a single mine depending on the local environment or geology. Steel mesh often runs continuously in long stretches within mine access drifts and tunnels, potentially electrically connecting areas of higher to lower corrosion. The National Institute for Occupational Safety and Health (NIOSH) investigated whether corrosion levels may be locally heightened from current flowing between ground support with different electrical potentials in their respective areas. Rockbolts placed in dissimilar laboratory environments were electrically linked to each other and monitored for current flow, thickness, and weight loss against control samples. Within these tests, 2 isolation methods – resin and phenolic plates – were evaluated to observe their effect on the current flow and corrosion rates. Rockbolts had an initially higher corrosion rate when linked to a differing environment without grouting and/or phenolic plate isolation methods before the reactions reached their stable passivated rates. The current flow for environment pairings with one or both isolation types had a lower cumulative current over time, supporting their efficacy. Investigating methods to limit corrosion rates is necessary to boost safety and understanding of the longer-term structural integrity of ground support in corrosive mine environments.

Keywords: corrosion, ground support, electrical monitoring, electrical isolation, support degradation

References:
Ansari, TQ, Luo, JL & Shi, SQ 2019, ‘Modeling the effect of insoluble corrosion products on pitting corrosion kinetics of metals’, Npj Materials Degradation, vol. 3, no. 28,
ASTM International 2017, Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens (ASTM G1-03), West Conshohocken.
Benton, DJ, Sweet, DJ & Emery, TM 2022, ‘Comparative Analysis of Synthetic and Steel Mesh Performance’, in Proceedings of the 56th US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Westminster.
British Standards Institution 2006, Cathodic Protections of Steel in Concrete (BS EN 12696.2000), London.
Chen, J, He, F & Zhang, S 2020, ‘A study of the load transfer behavior of fully grouted rock bolts with analytical modelling’, International Journal of Mining Science and Technology, vol. 30, no. 1, pp. 105–109,
AMPP n.d., Corrosion Basics, Houston
The%20elements%20that%20are%20common,between%20the%20anode%20and%20cathode
Dorion, JF & Hadjigeorgiou, J 2019, ‘Microbiologically influenced corrosion (MIC) of ground support’, Geotechnical and Geological Engineering, vol. 38, pp. 375–387,
Hassell, RC 2008, Corrosion of Rock Reinforcement in Underground Excavations, PhD thesis, Curtin University, Perth.
Hussein Farh, HM, Seghier, MEA & Zayed, T 2023, ‘A comprehensive review of corrosion protection and control techniques for metallic pipelines’, Engineering Failure Analysis, vol. 143, no. Part A,
Moran, A, Jennings, J, Pearson, S, Clark, B & Lillard, RS 2019, ‘Coating breakdown and galvanically accelerated crevice corrosion of aluminum alloys 2024 and 7075 at cadmium-plated steel fasteners’, Corrosion The Journal of Science and Engineering, vol. 75, no. 5, pp. 484–498,
Nourizadeh, H, Mirzaghorbanali, A, McDougall, K & Aziz, N 2025, ‘Exploring the axial performance of protective sheathed rock bolts through large-scale testing’, Tunnelling and Underground Space Technology, vol. 155, no. 1,
10.1016/j.tust.2024.106157
Rafiqul Islam, M 2023, ‘Chapter 10 - Corrosion and its mitigation’, Pipelines Emerging Technologies and Design Criteria, Gulf Professional Publishing, Cambridge, pp. 705–839.
Stazick, C, Feagan, G & Sunderman, S 2023, ‘Accelerated galvanic corrosion between graphitic rock from underground mines and metal coupons’, in J Wesseloo (ed.), Ground Support 2023: Proceedings of the 10th International Conference on Ground Support in Mining, Australian Centre for Geomechanics, Perth, pp. 439–450, 
Zhang, XG 2011, ‘Galvanic corrosion’, Uhlig's Corrosion Handbook, 3rd edn, John Wiley & Sons, New Jersey, pp. 123–143.




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