Macro-micro investigation of catastrophic damage and durability degradation in anchorage structures under corrosion

Abstract

To thoroughly investigate the damage evolution of anchorage structures under corrosive conditions, laboratory simulations of corrosive environments were conducted, including corrosion tests and mechanical performance evaluations on anchorage systems. Based on experimental results, relationships were analyzed between factors (prestress, pH value, and anti-corrosion methods) and the corrosion degree, macro-micro characteristics, and mechanical performance degradation patterns of specimens. The results of the test indicated that: (1) the corrosion of coal bodies increases over time, and lower pH environments correspond to lower uniaxial compressive strength of coal bodies; (2) the corrosion of the rock bolts increases over time, the maximum mechanical performance in the rock bolts loss occurs at pH ​= ​5.0, and higher prestress of the rock bolts leads to greater mechanical degradation, and galvanization effectively reduces corrosion in functional rock bolts; (3) the degree of corrosion in the anchorage bodies has increases over time, pH ​= ​5.0 causes maximum bond strength of the anchorage bodies property loss and increases the prestress in the anchorage bodies exacerbates bond strength degradation, and double anti-protected anchorage bodies show less bond strength loss than ordinary ones. The corrosion-induced structural deterioration of underground anchorage systems leads to significant mechanical performance degradation, potentially causing support failure, surrounding rock instability, and roof fall disasters. Greater attention therefore needs to be paid to this area.

Keywords

Corrosive environment / Anchorage structure / Coal mass medium / Durability / Microscopic testing / Disaster prevention and mitigation

CRediT authorship contribution statement

Aiwen Wang: Writing - review & editing, Methodology, Investigation, Funding acquisition, Conceptualization. Yibo Wu: Writing - original draft, Software, Methodology, Formal analysis, Conceptualization. Benjiang Zhang: Validation, Project administration. Xinyang Bao: Validation, Investigation.

Data availability

All data from this study are included in the submitted manuscript.

Declaration of competing interests

The author declares that there are no conflicts of interest or competitive interests related to this study. Benjiang Zhang from Shenyang Coking Coal Company Limited in China also declares the no conflicts of interest.

Acknowledgements

This research was supported by the National Natural Science Foundation of China: Damage Mechanism and Stability Precursor Characteristics of Gradient Enclosure Structures in Impact Hazardous Roadways under Dynamic and Static Loads (No. 52374201).

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