Experiments on stress corrosion behaviors of rock bolt in highly-mineralized mine water

被引：0
作者：
Chu X. [1 ,2 ,3 ]
Ju W. [1 ,2 ,3 ]
Lu Z. [1 ,3 ]
Shi M. [1 ,3 ]
机构：
[1] CCTEG Coal Mining Research Institute, Beijing
[2] School of Energy and Mining Engineering, China University of Mining and Technology(Beijing), Beijing
[3] Mining Institude, China Coal Research Institute, Beijing
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 02期
关键词：
highly-mineralized mine water; hydrogen induced cracking; plasticity; rock bolt; stress corrosion susceptibility;
D O I：
10.13247/j.cnki.jcumt.20210826
中图分类号：
学科分类号：
摘要：
For the problem of stress corrosion cracking of threaded rebar rock bolt in corrosive environment underground coal mine, the stress corrosion behaviors of four rock bolt materials in simulated highly-mineralized mine water were studied by slow strain rate test. Consequently, the influence rules of strain rate and applied potential on the stress corrosion behavior of rock bolt was obtained. The stress corrosion sensitivity was quantitatively evaluated, and the stress corrosion mechanism was explained in combination based on the microscopic characteristics of fracture. The research results show that the plasticity of rock bolts decreased obviously in simulated mine water, showing stress corrosion susceptibility. The effect of strain rate on area shrinkage and elongation is greater than that on strength. The stress corrosion susceptibility of rock bolts increased significantly after the application of cathode potential. Under the participation of corrosion, the fracture form of bolt changes from ductile-brittle mixed fracture to brittle fracture, and the higher the stress corrosion sensitivity, the more obvious the brittle characteristics. Based on the stress corrosion characteristics and fracture morphology e-volution process of anchor bolts in different environments, it is concluded that hydrogen induced cracking was the main mechanism of the stress corrosion of rock bolt. The analysis of in-situ rock bolt failure shows that corrosion participated in the cracking process and the fractures arc characterized by stress corrosion cracking. © 2023 China University of Mining and Technology. All rights reserved.
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页码：255 / 266
页数：11
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