Triaxial compressive failure of thermally damaged granite following low- and high-cycle fatigue loading
This paper investigated the triaxial compressive characteristics of thermally damaged granite following cyclic loading. Thermal treatments at various high temperatures (200.0 °C, 400.0 °C, 500.0 °C, and 600.0 °C) were performed on granite. Fatigue treatments utilizing different cyclic modes, includi...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025012174 |
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| Summary: | This paper investigated the triaxial compressive characteristics of thermally damaged granite following cyclic loading. Thermal treatments at various high temperatures (200.0 °C, 400.0 °C, 500.0 °C, and 600.0 °C) were performed on granite. Fatigue treatments utilizing different cyclic modes, including low-cycle fatigue (LCF) and high-cycle fatigue (HCF), were conducted on thermally damaged granite under various confining pressures (0.0 MPa, 1.0 MPa, 3.0 MPa, and 5.0 MPa). The mechanical responses of thermally damaged granite subjected to cyclic loading, including the stress-strain curve, peak strength, and elastic modulus, were investigated using a triaxial compression test. The strength variation of granite due to cyclic loading was assessed by introducing a difference coefficient. Additionally, the effects of temperature and confining pressure on this difference were discussed. Moreover, a predictive method for the peak strength of thermally damaged granite after HCF was proposed. The results indicate that as the temperature increases, the peak strength and elastic modulus of thermally damaged granite after LCF and HCF first remain approximately constant and then decrease. Meanwhile, these mechanical indices demonstrate an increasing trend with increasing confining pressure. Higher temperatures exacerbate the variations in the bearing capacity of the granite caused by cyclic modes, but confining pressure suppresses this difference. The coefficient of peak strength first remains approximately constant and then increases rapidly with increasing temperature, while it monotonously decreases with increasing confining pressure. Moreover, the proposed method can predict the peak strength of thermally damaged granite after HCF based on the results obtained after LCF with an acceptable error. |
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| ISSN: | 2590-1230 |