Environmental characterization of the stress-corrosion cracking of rockbolts in underground coal mines using laboratory and in-situ testing

摘要

This paper describes a program that has been developed for stress corrosion cracking testing of rockbolt steels both in-situ in underground mines and in a controlled laboratory environment. Two types of double bent beam specimen have been used, a pin loaded specimen stressed to just above the yield stress, and a bar loaded specimen stressed almost to the ultimate tensile strength. Testing of the specimens in an acidified 3.5% sodium chloride solution containing hydrogen sulfide has verified the efficacy of both designs.