Environmental influence on the stress corrosion cracking of rock bolts

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dc.contributor.authorGamboa, E.
dc.contributor.authorAtrens, A.
dc.date.issued2003
dc.descriptionCopyright © 2003 Elsevier Ltd. All rights reserved.
dc.description.abstractIn order to understand rock bolt Stress Corrosion Cracking (SCC), a series of experiments have been performed in Linearly Increasing Stress Test (LIST) apparatus. One series of experiments determined the threshold stress of various bolt metallurgies (900 MPa for Steel A, and 800 MPa for Steel B and C). The high values of threshold stress suggest that SCC begins in rock bolts when they are sheared by moving rock strata. Typical crack velocity values have been measured to be 2.5 × 10<sup>-8</sup> m s<sup>-1</sup>, indicating that there is not much benefit for rock bolt steel of higher fracture toughness. Another series of experiments were performed to understand the environmental conditions causing SCC of steel A and galvanised Steel A rock bolt steel. SCC only occurred for environmental conditions for which produce hydrogen on the sample surface, leading to hydrogen embrittlement and SCC. Fracture surfaces of LIST samples failed by SCC were found to display the same fracture regions as fracture surfaces of rock bolts failed in service by SCC: Tearing Topography Surface (TTS), Corrugated Irregular Surface (CIS), quasi Micro Void Coalescence (qMVC) and Fast Fracture Surface (FFS). Water chemistry analysis were carried out on samples collected from various Australian mines in order to compare laboratory electrolyte conditions to those found in underground mines. © 2003 Elsevier Ltd. All rights reserved.
dc.description.statementofresponsibilityErwin Gamboa and Andrej Atrens
dc.description.urihttp://www.elsevier.com/wps/find/journaldescription.cws_home/30190/description#description
dc.identifier.citationEngineering Failure Analysis, 2003; 10(5):521-558
dc.identifier.doi10.1016/S1350-6307(03)00036-0
dc.identifier.issn1350-6307
dc.identifier.issn1873-1961
dc.identifier.urihttp://hdl.handle.net/2440/43390
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.source.urihttps://doi.org/10.1016/s1350-6307(03)00036-0
dc.subjectStress corrosion cracking
dc.subjectRock bolts
dc.subjectFracture
dc.subjectSteel
dc.subjectLinearly Increasing Stress Test (LIST
dc.titleEnvironmental influence on the stress corrosion cracking of rock bolts
dc.typeJournal article
pubs.publication-statusPublished

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