Abstract
A series of tests were performed to study the mechanical properties of granite subjected to triaxial cyclic loading–unloading compression under hydro-mechanical coupling. The results show that the damage and permeability evolution of rock are interrelated, and the permeability is closely related to the microfracture propagation during the damage process. The cyclic load magnitude has a controlling effect on the fatigue behavior of the material. When different loading magnitudes are selected, the specimens show different correlation between permeability and residual strain. The correlation analysis between volumetric residual strain and permeability evolution shows that cyclic load not only causes fatigue damage to rock, but also has compaction effect. When confining pressure is larger, the effect of the cyclic load magnitude on the damage will be relatively lower. The linear models of permeability, deformation modulus, radial–axial strain ratio, residual strain, and cyclic load were established to analyze the sensitivity of each parameter to damage. The initial microfractures in granite specimens increase after thermal cycling test, and the P-wave velocity first decreases and then tends to be stable in the whole process. Scanning electron microscope observation shows that more microfractures develop along the axial direction of specimens, which indicates that fatigue damage has directivity.
Highlights
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The larger the confining pressure, the smaller the influence of cyclic load magnitude on the damage.
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High-cycle fatigue behavior shows that rock permeability decreases and the compactness increases.
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Acknowledgements
Much of the work presented in this paper was supported by the National Natural Science Foundations of China (Grant numbers 51379112, 51422904, 40902084, and 41877239), and Fundamental Research Funds for the Central Universities (Grant number 2018JC044), and Shandong Provincial Natural Science Foundation (Grant number JQ201513).
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Ning, Z., Xue, Y., Li, Z. et al. Damage Characteristics of Granite Under Hydraulic and Cyclic Loading–Unloading Coupling Condition. Rock Mech Rock Eng 55, 1393–1410 (2022). https://doi.org/10.1007/s00603-021-02698-3
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DOI: https://doi.org/10.1007/s00603-021-02698-3