Corrosion Behavior and Failure Mechanism of Bolts Under High Corrosion Environment in Deep Mine

Xin Sun, Jingyi Cheng (), Jiakun Lv (), Hua Wang, Zejie Wei, Jie Xu and Luchang Xiong
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Xin Sun: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Jingyi Cheng: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Jiakun Lv: School of Naval Architecture & Ocean Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China
Hua Wang: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Zejie Wei: China Coal Xi’an Design Engineering Co., Ltd., Xi’an 710000, China
Jie Xu: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Luchang Xiong: School of Mines, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2025, vol. 17, issue 22, 1-24

Abstract: In deep coal mines characterized by high temperature, high humidity, high-salinity water, and elevated ground stress, stress corrosion cracking (SCC) of bolts is widespread, causing frequent instability of roadway surrounding rock and hindering long-term stability. This study systematically examines the failure characteristics of anchorage materials in highly corrosive roadways and clarifies the effects of deep-mine temperature and humidity on material corrosion. Long-term corrosion tests on bolts reveal changes in mechanical properties and macroscopic morphology and elucidate the intrinsic mechanisms of SCC. The results show that with the increase in corrosion time, the yield strength, ultimate load and elongation of the anchor rod decrease by up to 11.8%, 13.6%, and 7.08%, respectively. Under high stress, localized corrosion pits form on bolt surfaces, rupturing the oxide film and initiating rapid anodic dissolution and cathodic hydrogen evolution. Interaction between corroded surfaces and microcracks produced by internal impurities leads to progressive damage accumulation and ultimate fracture of the bolts. These findings provide guidance for corrosion protection of coal mine roadway support materials and for improving the long-term performance of roadway supports.

Keywords: stress corrosion cracking (SCC); corrosion mechanism; high corrosion environment; roadway support failure; sustainable application of roadway (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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