Laboratory methods for investigation on stress corrosion cracking of rockbolts and cable bolts

© 2018 ISRM & SRMEG (Singapore) Catastrophic failure of rockbolts and cable bolts, due to stress corrosion cracking (SCC), is a major problem in many underground excavations that can compromise both safety of the workers and the economic viability of the operations. This paper reports on development of laboratory instruments and methodologies at UNSW Sydney for simulating SCC in laboratory environments. Both representative coupon testing, and full-scale rockbolt and cable bolt testing methodologies are presented. Coupled with a detailed environment characterisation and field tests, the laboratory methodologies will aid in further understanding of SCC and identifying the potential countermeasures to prevent SCC occurrence in underground excavations.