Abstract
This work aims at investigating the fracture evolution and energy characteristics of marble subjected to fatigue cyclic loading and confining pressure unloading (FC-CPU) conditions. Although rocks under separated fatigue cyclic loading and triaxial unloading conditions have been well studied, little is known about the dependence of the fatigue damage accumulation on the subsequent confining pressure unloading condition that influences the rock fracture behaviors. In this work, the servo-controlled GCTS 2000 rock mechanical system combined with the post-test X-ray computed tomography (CT) scanning technique were used to reveal the fracture behaviors of the marble samples. The samples were tested at three stages: the static loading stage, the fatigue cyclic loading stage, and the confining pressure unloading stage. Results show that the damage index-cycle number curve shows a different pattern—the damage increasing rate is different for the samples experiencing different fatigue damage. The damage accumulation at the fatigue cyclic stage influences the final failure mode and energy conversion. In addition, post-test CT scanning further reveals the effects of fatigue cycles on the crack pattern, as well as the stimulated crack scale and density after FC-CPU testing depending on the fatigue cycle. Furthermore, the stored elastic energy decreases and the dissipated energy increases with increasing fatigue cycle at the fatigue loading stage, and the energy conversion is consistent with the crack pattern analysis. By investigating the failure mechanism of marble under FC-CPU conditions, a theoretical basis for rock dynamic disaster prediction can be created.
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Abbreviations
- FC-CPU:
-
Fatigue cyclic-confining pressure unloading
- FCL:
-
Fatigue cyclic loading
- U :
-
Total strain energy
- U 0 :
-
Absorbed strain energy
- U 1 :
-
Axial strain energy
- U e :
-
Elastic strain energy
- U d :
-
Dissipated energy
- U 3 :
-
Circumferential strain energy
- XRD:
-
X-ray powder diffraction
- CT:
-
Computed tomography
- σ 1 :
-
Axial stress
- σ 3 :
-
Confining pressure
- σ d :
-
Stress amplitude
- ε 1 :
-
Axial strain
- ε 3 :
-
Lateral strain
- ε v :
-
Volumetric strain
- ε 0 :
-
Axial strain at the end of first loading stage
- ε d :
-
Axial strain at the end of the second loading stage
- SEM:
-
Scanning electron microscope
- CP:
-
Confining pressure
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Acknowledgements
The authors would like to thank the editors and the anonymous reviewers for their helpful and constructive comments. Many thanks to Dr. X. M. Wei for his providing of the stope structure of Lilou iron mine. This study was supported by the Beijing Natural Science Foundation of China (8202033), the National Key Technologies Research and Development Program (2018YFC0808402), the Key Laboratory of Geo-hazards Prevention and Geo-environment Protection (Chengdu University of Technology) (SKLGP2019K017), and the Fundamental Research Funds for the Central Universities (FRF-TP-20-004A2).
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Wang, Y., Feng, W.K., Hu, R.L. et al. Fracture Evolution and Energy Characteristics During Marble Failure Under Triaxial Fatigue Cyclic and Confining Pressure Unloading (FC-CPU) Conditions. Rock Mech Rock Eng 54, 799–818 (2021). https://doi.org/10.1007/s00603-020-02299-6
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DOI: https://doi.org/10.1007/s00603-020-02299-6