Design and Evaluation of the Roof Bolt Corrosion Test System in a Simulated Underground Coal Mine Environment

Bylapudi, Gopi; Spearing, A.J.S.; Mondal, Kanchan; Bhagwat, Anand

doi:10.1007/s42461-019-00164-x

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…Several preliminary findings on rock bolt corrosion in U.S. mines have been published by Spearing and his research group at SIUC (Bylapudi 2010;Spearing et al 2010cSpearing et al , 2010aSpearing et al , 2010bPile 2012;Spearing et al 2013;Bylapudi et al 2015). One of the significant problems with rock bolt corrosion is the stresses they undergo in the respective environment (Bylapudi et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…2013; Bylapudi et al. 2015). One of the significant problems with rock bolt corrosion is the stresses they undergo in the respective environment (Bylapudi et al.…”

Section: Introductionmentioning

confidence: 99%

“…One of the significant problems with rock bolt corrosion is the stresses they undergo in the respective environment (Bylapudi et al. 2015). After careful consideration, preliminary experiments on stress corrosion of this steel have been performed, and the results are published in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Stress corrosion testing of roof bolt grade 60 steel in simulated underground coal mine atmosphere

et al. 2019

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Corrosion of roof bolts in underground mine environments could have an adverse impact on ground control, which is directly related to workforce safety. Past studies state that stress corrosion cracking (SCC) of roof bolts is a significant problem in underground coal mines, resulting in premature bolt failures. However, it has not been seriously studied in U.S. underground coal mines. As a preliminary study, the most common roof bolt material used in U.S. mines, ASTM A 615 Grade 60 steel, was studied under stress corrosion conditions. ASTM G30 standard was applied to achieve this and tested in the simulated coal mine conditions. SCC was observed on samples that were tested for 180 days. Chloride SCC (ClSCC) was found to be the corrosion mechanism resulting in cracks from the EDS data. This paper mainly discusses the test protocol, shortcomings of this preliminary testing and makes recommendations based on the observations and results.

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Section: Introductionmentioning

confidence: 99%

“…2013; Bylapudi et al. 2015). One of the significant problems with rock bolt corrosion is the stresses they undergo in the respective environment (Bylapudi et al.…”

Section: Introductionmentioning

confidence: 99%

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Stress corrosion testing of roof bolt grade 60 steel in simulated underground coal mine atmosphere

et al. 2019

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“…The aim of this test is to adopt bolt reinforcement which can last more than one hundred years. The durability of the anchorage system is affected by groundwater, fluctuating temperature, and other environmental factors when the traditional steel bar is used to reinforce the slope, coal mine and other projects [1][2][3][4][5][6]. Compared with the traditional steel bars, the new Glass Fibre Reinforced Polymer (GFRP) bar has the advantages of high strength, light weight, low modulus, and corrosion resistance [7][8][9] and can be used to solve the durability problem of anchorage structures.…”

Section: Introductionmentioning

confidence: 99%

Comparative Test on the Bond Damage of Steel and GFRP Bars Reinforcing Soft Rock Slopes

Bakarr

et al. 2021

Applied Sciences

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Soft rock slopes were anchored with traditional steel bars and new Glass Fibre Reinforced Polymer (GFRP) bars. The difference in the anchorage performance of the two kinds of anchorage elements in soft rock and expansive soil was studied by an in-situ test. The results show that cyclic load can aggravate the bond damage of the interface between grouting body and both kinds of bars used in soft rock. Compared with the number of cyclic loads applied, the previous maximum load is the main factor that influences the bond damage of the anchorage bar. Under constant loading, the interface bond behaviour of GFRP bar is better than the steel bar. Because of the small difference in elastic modulus between the GFRP bar and the grouting body, the interface bond around the GFRP bar can invoke more resistance of the grouting body efficiently which demonstrates its more effective anchorage performance than the steel bar under the same conditions. The anchorage structure of steel bar in soft rock can generate larger interfacial relative displacement with increasing load than the GFRP bar in the anchorage section, even though the elastic modulus of steel is much larger than GFRP. In the expansive soil, the anchorage structure deformations of steel and GFRP bars are almost the same because of the weaker bond at the interface of the grouting body and the surrounding soil than that of the bar interface. Under the ultimate loading of the anchorage structure in soft rock, the steel bar with 450 MPa which is less than its ultimate strength shows the failure of the bar body pulling-out, and the GFRP bar with 508 MPa which is larger than its ultimate strength shows the failure of the bar body by fracture. The steel bar anchorage structure in soft rock is destroyed at the interface around the grouting body. The results show that the GFRP bar performs more efficiently than the steel bar.

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“…However, the durability of these installations may also depend on their corrosion properties in mine environments they are subjected to (Divi et al 2011). Rock bolt corrosion in underground mines is, therefore, a potential threat to the mine safety (Shutter et al 2001; Hebblewhite et al 2003; Elias et al 2013; Spearing et al 2013; Aziz et al 2014; Bylapudi et al 2015; Kang et al 2015; Bylapudi et al 2019; Guo et al 2019; Bylapudi et al 2020; Chen et al 2018). Corrosion is an electrochemical process, and hence understanding the electrochemical properties of the rock bolt steel in underground mines is vital.…”

Section: Introductionmentioning

confidence: 99%

Corrosion properties of ASTM A615 rock bolt steel in US underground coal mines

et al. 2020

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Corrosion of rock bolts is a relatively slow process yet a potential problem for the underground mining industry. Mine groundwater in the strata through natural or mining-induced cracks together with the humid environment in the mine openings interact with the roof support systems often resulting in corrosion. Electrochemical studies of the commonly used rock bolt steel in the coal mining environments will lead to a better understanding of the material's performance and their ability to resist corrosion. The influence of pH, solution resistivity, total dissolved solids, and aggressive ions on the electrochemical properties of rock bolt steel are discussed. This preliminary study focuses on understanding the corrosion potential, polarization resistance, and corrosion rates of the rock bolt steel that is most commonly used in US underground coal mines. Based on the findings, it was observed that the polarization resistance (Rp) is inversely proportional to the corrosion rate (CR) over time.

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Design and Evaluation of the Roof Bolt Corrosion Test System in a Simulated Underground Coal Mine Environment

Cited by 5 publications

References 17 publications

Stress corrosion testing of roof bolt grade 60 steel in simulated underground coal mine atmosphere

Stress corrosion testing of roof bolt grade 60 steel in simulated underground coal mine atmosphere

Comparative Test on the Bond Damage of Steel and GFRP Bars Reinforcing Soft Rock Slopes

Corrosion properties of ASTM A615 rock bolt steel in US underground coal mines

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