Investigation into the durability and stress corrosion cracking of cable bolts in underground mine environments
To solve the problem of durability degradation and fracture of cable bolts in deep underground engineering,the paper combines the laboratory experiments and hydrogeochemical models.Experiments were carried out in simulated underground environments and various factors affecting the stress corrosion of anchor cable were analyzed and discussed.Hydrogeochemical modelling was estab-lished based on the data collected from the test.The formation of corrosion products,the change of some ion concentration and factors related to corrosion rate were quantitatively studied in corrosion process.The results show that,in which dissolved oxygen is the main factor.Erosive ions are main factors affec-ting local corrosion.Stress level,pH and electrical conductivity are auxiliary factors.Localized corrosion induces stress concentration and high corrosive environment at bottom of corrosion pit,which further ac-celerates the stress corrosion cracking.In addition,studies show sulphide will be generated in the pre-sence of microorganisms which plays a key role in the occurrence of stress corrosion.Therefore,micro-organisms are one of the potential factors of stress corrosion of deep anchorage materials.
万方数据
维普
