ICGCM Papers:
Roof Support Design and Evaluation
 
 
A Method to Determine the Corrosion Potential of Rock Bolts on Coal Mines
29th International Conference on Ground Control in Mining
A Method to Determine the Corrosion Potential of Rock Bolts on Coal Mines
by
Anthony (Sam) Js Spearing, Western Australian School of Mines, Kalgoorlie, AustraliaKanchan MondalGopi Bylapudi, Southern Illinois University Carbondale, Carbondale, United StatesJoseph C Hirschi, Illinois Clean Coal Institute, Carterville, United States
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Author's Presentation PPT
[Conference] 29th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Roof Support Design and Evaluation
[Author] Anthony (Sam) Js Spearing, Western Australian School of Mines, Kalgoorlie, AustraliaKanchan MondalGopi Bylapudi, Southern Illinois University Carbondale, Carbondale, United StatesJoseph C Hirschi, Illinois Clean Coal Institute, Carterville, United States
[Abstract] 
The US coal mining industry uses about 100 million rock anchors per year. Corrosion has been found to be an issue in Australian coal mines where the problem has been well researched and stress corrosion has been found to be a significant cause of rock falls. Corrosion is also a major concern for underground civil construction in the US but has not been considered an issue or adequately researched in coal mines. Conditions are conducive to corrosion underground mainly because of water quality. There is a perception that when bolts are fully grouted, adequate corrosion protection is offered to the steel. Research has shown that this is not necessarily the case due to the formation of micro-cracks as the resin sets and with subsequent rock movement shearing the resin column. Research in the lab and in three mines, quantifying the potential problem is summarized in this paper. The paper also outlines a method to determine the corrosion potential of bolts used in long term excavations and suggests ways to mitigate such effects.