Abstract
The application of basalt fiber-reinforced polymer (BFRP) anchors has gained significant attention, particularly in the field of geotechnical anchorage engineering because of its high strength and corrosion resistance. The research on the applicability of BFRP anchor in a tunnel—slope system under rainfall is of practical significance to solve the problem of instability damage to anchored slopes caused by corrosion of steel anchors. In this study, model tests of BFRP and steel anchorage structures were conducted to compare their reinforcement capability in a tunnel—slope system under heavy rainfall. The results show that the BFRP anchorage structure is better than the steel in coordinating slope deformation and stabilizing earth pressure around the tunnel. The deformation of slopes under rainfall is classified into four stages: initial, isokinetic, accelerated, and blocked deformations. BFRP anchors have the same axial strain distribution pattern as the steel anchors, and they are convexly distributed along the axial direction of the anchors. The correlation analysis and Pearson linear correlation analysis of the multi-attribute data of the slope and BFRP anchors showed a positive correlation among BFRP anchor strain, earth pressure inside the slope, slope deformation displacement, and accumulated rainfall. These research results provide a basis and reference for the application of BFRP anchors in the anchorage engineering of the tunnel—slope system under rainfall action.
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Acknowledgements
This research was supported by the National Key R&D Program of China (Grant No. 2018YFC1504901), Science and Technology Fund Program of Gansu Province for Young People (22JR5RA778), Science and Technology Development Project of China Railway 11th Bureau Group Corporation Limited (Grant No. 2021-06), Gansu Province Youth Science and Technology Fund program, China (Grant No. 21JR7RA739), Natural Science Foundation of Gansu Province, China (Grant No. 21JR7RA738), Science and Technology Development Project of China Railway Research Institute Co. Ltd (2017-KJ008-Z008-XB).
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Tang, L., Wu, Hg., Wei, H. et al. Application of a new basalt fiber-reinforced polymer anchorage structure in the tunnel—slope system under rainfall action. J. Mt. Sci. 20, 570–584 (2023). https://doi.org/10.1007/s11629-022-7483-6
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DOI: https://doi.org/10.1007/s11629-022-7483-6