Investigation of cable bolts for stress corrosion cracking failure. (30th October 2018)

• Record Type: Journal Article
• Authors: Wu, Saisai; Chen, Honghao; Lamei Ramandi, Hamed; Hagan, Paul C.; Hebblewhite, Bruce; Crosky, Alan; Saydam, Serkan
• Is Part Of: Construction & building materials. Volume 187(2018)
• Page Start: 1224
• Page End: 1231
• Publication Date: 2018-10-30
• Subjects: Cable bolt failure -- Stress corrosion cracking -- Hydrogen embrittlement; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.08.066
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: A framework for simulating stress corrosion cracking (SCC) of full-size cable bolts was developed. Periodically increasing strain rate (PISR) successfully recreated field SCC in laboratory. The effects of wire arrangement, galvanisation and indentation on SCC susceptibility were examined. Plain wire Superstrand bolts provided the greatest resistance to SCC. Galvanising improved the resistance of cable bolts to SCC and delayed the cable bolt failure. Abstract: Premature failure of cable bolts due to stress corrosion cracking (SCC) in mining and civil industries is a worldwide problem with limited cost-effective solutions. A load frame capable of applying tensile loads was designed and constructed to simulate and examine SCC of full-size cable bolts (up to 2.4 m in length) under simulated in-situ conditions. The tension loading apparatus was used to conduct periodically increasing strain rate (PISR) tests on cable bolts in simulated underground environments. The PISR test was appropriate and reliable for examining SCC susceptibility of TG and Superstrand cable bolts including the effects of wire arrangement, galvanisation and indentation. Overall, TG cable bolts were more susceptible to SCC than Superstrand cable bolts. In each type of cable bolt, the one with plain wires was approximately 30% more resilient to SCC in terms of time to failure than the one with indented wires. Galvanising was not able to prevent SCC, however it considerably delayed SCC occurrence. The results of this study provided detailed insight into SCC of different types of cable bolts and can be further used for setting up optimal support regimes in different geological and environmental conditions.