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Manefield, Mike
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document
Microbiologically influenced stress corrosion cracking of cable bolts in underground mines
Abstract
Cable bolts are widely used in underground mine to reinforce rock strata. They are generally made from high-carbon cold-drawn steel wire which have relatively high strength and flexibility. In past two decades, failure of cable bolts has frequently been reported from the mines. The preliminary studies indicated the failures were due to Stress Corrosion Cracking (SCC). Recent studies determined the presence of a particular type of bacteria, known as Sulphate Reducing Bacteria (SRB), can contribute to corrosion failure of the steel. In this study, one of the SRB found in the underground mines was used to examine its ability to cause Microbiologically Influenced Stress Corrosion Cracking (MISCC) in cable bolts. It was observed that stressed cable bolts specimens were all failed through MISCC within 60 days. The results indicate that SCC of cable bolts can occur in underground mines by the influence of SRB where the environments are suitable for SRB to grow at high concentration.