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

Craig, Peter; Serkan, S.; Hebblewhite, Bruce; Vandermaat, Damon; Crosky, A.; Elias, E.

doi:10.1016/j.ijmst.2015.11.011

Cited by 60 publications

(39 citation statements)

References 4 publications

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“…Several underground coal mines with known prematurely failed rock bolts are investigated. Variables representing the environmental and geotechnical information are collected and used to build the database . One dataset is extracted from the database, which contains 160 samples of roof panels collected from 1 mine site in New South Wales (NSW), Australia.…”

Section: Case Studymentioning

confidence: 99%

Risk assessment of failure of rock bolts in underground coal mines using support vector machines

Jiang

Craig

Crosky

et al. 2017

Appl Stoch Models Bus & Ind

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In recent years, there has been an increasing incidence of failure of rock bolts due to stress corrosion cracking and localized corrosion attack in Australian underground coal mines. Unfortunately, prediction of the risk of failure from results obtained from laboratory testing is not necessarily reliable because it is difficult to properly simulate the mine environment. An alternative way of predicting failure is to apply machine learning methods to data obtained from underground mines. In this paper, support vector machines are built to predict failure of bolts in complex mine environments. Feature transformation and feature selection methods are applied to extract useful information from the original data. A dataset, which had continuous features and spatial data, was used to test the proposed model. The results showed that principal component analysis-based feature transformation provides reliable risk prediction.

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Section: Case Studymentioning

confidence: 99%

Risk assessment of failure of rock bolts in underground coal mines using support vector machines

Jiang

Craig

Crosky

et al. 2017

Appl Stoch Models Bus & Ind

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“…They are used as a coating over metal surfaces due to its resistance towards wear and corrosion. Significance of Fe-Cr-C alloys as precipitated carbides is also well known in several industries, such as drilling [2,3], mining [4,5], oil and gas [6,7] and fuel cells [8,9].…”

Section: Introductionmentioning

confidence: 99%

Structural and electronic properties of chromium carbides and Fe-substituted chromium carbides

Ganguly

Murthy

Kannoorpatti

2020

Mater. Res. Express

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Chromium carbides are coated over base metal (Fe) to increase wear and corrosion resistance. The electronic structure and bonding properties for chromium carbide bulk phases (Cr 3 C 2 , Cr 7 C 3 and Cr 23 C 6 ) and Fe-substituted chromium carbides is investigated using Density Functional Theory (DFT). The bonding in these carbides has been interpreted in the form of partial density of states, electron density distribution and Mulliken population method. Cr 3 C 2 exhibits the strongest covalent character while Cr 7 C 3 displays the highest metallicity. Cr 3 C 2 showed the highest stability among the chromium carbide phases. In the Fe-substituted chromium carbides (Cr 2 FeC 2 ), the site preference of Fe in Cr 3 C 2 system has been reported. In Fe-substituted chromium carbides also show both of metallic and covalent character and Cr 2 Fe3C 2 is found to be the most stable Fe-substituted chromium carbide system.

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“…Later, Crosky et al (2003b) reported that many of the broken bolts collected from four mine had failed from SCC. Along with Crosky et al (2003b), studies concerned with the corrosion of rock bolts and cable bolts in underground mines has gained considerable following in recent years (Chen et al 2018;Craig et al 2016;Hassell 2008;Vandermaat 2015;Vandermaat et al 2016;Wu et al 2018a, c).…”

Section: Introductionmentioning

confidence: 99%

“…the bolts (McCafferty 2010;Vandermaat et al 2016). Groundwater containing microorganisms that can contribute to steel corrosion has been found to play a significant role in causing SCC failure (Craig et al 2016). Crosky et al (2002) found that SCC in bolts was more prevalent in underground coal mines with thick coal roofs, saturated roof strata, and the presence of claystone or tuffaceous bands within the bolting horizon.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines

Smith

Ramandi

Zhang

et al. 2019

Int J Coal Sci Technol

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The service failure of rock bolts and cable bolts are frequently reported issues in underground coal mines. Whilst numerous experimental investigations concerned with the service failure of bolts have been conducted, numerical modelling offers an alternative approach in evaluating the factors contributing to service failures of bolts in underground mines. In this study, analysis of the influence of groundwater and tensile stress on bolts in underground coal mines was studied through the numerical modelling of a grouted bolt in the immediate roadway roof. Bolt tensile stress and groundwater dripping rates in the immediate roadway roof were analysed using a package based on finite element method to assess the effect of coal roof thickness and claystone bands, as main contributors of known service failures of bolts in roadways of underground coal mines. Increasing coal roof thickness was found to increase bolt dripping rates. Probable location of stress corrosion cracking (SCC) occurrence was established through examining the shift and increase in maximum bolt tensile stress that was exhibited along the bolt length with increasing coal roof thickness. Claystone bands situated at the top and centre horizon of a grouted bolt produced lower bolt dripping rates compared with scenarios with no claystone bands. Intersecting claystone bands at the centre horizon of a bolt for a fully grouted bolt could increase the likelihood of SCC corrosion and bolt failure by contributing to microbial corrosion processes and grout fracturing by tensile stress. This study improves the understanding the bolt failure associated with the presence of groundwater and changing stress environments, which in turn is imperative in formulating strategies to mitigate support element failures and improve the ground support viability.

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

Cited by 60 publications

References 4 publications

Risk assessment of failure of rock bolts in underground coal mines using support vector machines

Risk assessment of failure of rock bolts in underground coal mines using support vector machines

Structural and electronic properties of chromium carbides and Fe-substituted chromium carbides

Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines

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