Investigations into the corrosive environments contributing to premature failure of Australian coal mine rock bolts

作     者：Craig P. Serkan S. Hagan P. Hebblewhite B. Vandermaat D. Crosky A. Elias E. 

作者机构：School of Mining Engineering University of New South Wales Sydney NSW 2052 Australia School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2016年第26卷第1期

页      面：59-64页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：the UNSW ARC funded project,these companies include Anglo American Coal,BHP Billiton,Centennial Coal,Glencore,Jennmar Australia and Whitehaven Coal 

主　　题：RockboltStress corrosion crackingCorrosionCoal miningUltrasonic testing 

摘      要：University of New South Wales(UNSW Australia) had been involved in the study of premature failure of rock bolts in Australia coal mines from the initial identification of the problem in 1999. Rock bolt steel changes over the last decade appear to have not reduced the incidence of failures. A broadened UNSW research project funded by the Australian Research Council(ARC) and Industry has targeted finding the environmental causes through extensive field and laboratory experiments. This paper describes the field studies conducted in underground coal mines,in particular attempts to measure the contribution to corrosion from groundwater,mineralogy and microbial activity. Various underground survey techniques were used to determine the extent of broken bolts,with the presence of both stress corrosion cracking(SCC) and localized deep pitting making no single technique suitable on their *** found dripping from bolts across various coalfields in Australia were found to be not aggressive and known groundwater corrosivity classification systems did not correlate to where broken bolts were found. In-hole coupon bolts placed in roof strata containing claystone bands confirmed the clay as being a major contributor to corrosion. Microbes capable of contributing to steel corrosion were found to be present in groundwater,and culturing of the microbes taken from in-situ coupon bolts proved that the bacteria was present on the bolt surface. An ‘in-hole bolt corrosion coupon development by the project may have multiple benefits of (1) helping quantify newly developed corrosivity classification systems,(2) providing an in-situ ground support corrosion monitoring tool,and (3) for testing possible corrosion protection solutions.