Cumulative Deformation and Damage Evolution of Fiber Cement–Modified Iron Tailings under Cyclic Load
Publication: International Journal of Geomechanics
Volume 23, Issue 4
Abstract
The wasted iron tailings have poor engineering properties. Using polypropylene fiber and cement to modify iron tailings and in road engineering is an efficient way to utilize iron tailings as a resource. Dynamic triaxial tests were used to investigate the cumulative deformation and damage evolution of fiber cement–modified iron tailings (FCITs) with different fiber contents (Wf) and dynamic static ratios (Rcr) under cyclic load. In a study of the cumulative deformation of FCIT, it was found that increasing Rcr results in the cumulative deformation of FCIT. However, adding fibers to FCIT could minimize cumulative deformation by up to 70%. Furthermore, with an increase of Rcr, FCIT gradually changed from plastic shakedown to plastic creep and finally realized the deformation behavior of incremental failure. A plastic shakedown creep prediction formula with an error within ± 10% could be established according to the deformation behavior. The plastic shakedown creep prediction model could be further developed, and it was found that FCIT has the best deformation resistance when Wf = 0.75%. In the study of FCIT damage evolution, it was observed that adding fibers can improve the failure form of iron tailings under IF (incremental failure) conditions. The cumulative damage variable formula proved that the fiber significantly improves the cumulative damage of FCIT. However, when Wf > 0.75% and Wf < 0.75%, FCIT cumulative damage increased faster when Wf = 0.75%. Wf = 0.75% had the best effect on reducing FCIT cumulative damage.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China (Grant Number 41772311) and Zhejiang Provincial Natural Science Foundation of China (Grant Number LQ20E080042).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 4 • April 2023
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© 2023 American Society of Civil Engineers.
History
Received: Jun 15, 2022
Accepted: Oct 13, 2022
Published online: Jan 18, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 18, 2023
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