Abstract
Because the damage to cemented paste backfill (CPB) caused by orebody retrieval can be approximated as a loading process under different strain-rates, studying the sprouting and expansion patterns of microcracks in CPB under uniaxial compression to predict and evaluate fracture damage to CPB is essential. In this study, uniaxial compression tests, simultaneous acoustic emission, and digital image correlation monitoring tests of CPB under four strain-rates were conducted in a laboratory. Based on the principles of energy dissipation and damage mechanics, the energy consumption values of the CPB at different strain-rates were calculated, and the energy damage evolution process of the CPB damaged by compression was explored. The results show that (a) unlike high-strength rocks, CPB exhibits a critical strain-rate phenomenon, and when the strain-rate exceeds the critical value, the strength of CPB decreases with an increasing strain–rate. (b) As the strain-rate increases, the energy accumulated within the specimen cannot be effectively released, and the energy tends to accumulate in one part of the specimen. (c) The damage evolution curves of CPB at different strain-rate are all “S”-shaped and can be divided into phases of slow-growth damage, damage stabilization and accelerated growth, and damage growth rate slowdown. This study illustrates the damage evolution process of CPB under loading, which can be used in the study of CPB damage behavior resulting from orebody retrieval.
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Acknowledgements
The study has been supported by the National Natural Science Foundation (No. 51764013), by Training Plan for Academic and Technical Leaders of Major Disciplines of Jiangxi Province (20204BCJ22005), by China Postdoctoral Science Foundation funded project (Grant No. 2019M652277), by Natural Science Youth Foundation Key Projects of Jiangxi Province of China (Grant No.20192ACBL21014).
Funding
National Natural Science Foundation of China, No. 51764013, Kang Zhao, Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province, 20204BCJ22005, Kang Zhao, Postdoctoral Research Foundation of China, Grant No. 2019M652277, Kang Zhao, Youth Science Foundation of Jiangxi Province, Grant No.20192ACBL21014, Kang Zhao
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Zhao, K., Zhou, Y., Yu, X. et al. Strain-Rate Effects on the Crack Evolution Pattern and Damage Characteristics of Cemented Paste Backfill. Geotech Geol Eng 41, 295–310 (2023). https://doi.org/10.1007/s10706-022-02280-w
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DOI: https://doi.org/10.1007/s10706-022-02280-w