Abstract
Combined dynamic and static loading tests with equal impact energy (about 150 J) were conducted on granite after high temperature by an improved split Hopkinson pressure bar (SHPB) test device. Effect of axial compression ratios (ACR) on the strength, dynamic elastic modulus (Ed), failure behavior, dissipated energy, and fractal dimension of heat-treated samples was investigated. Results indicated that post-peak strain of samples before 300 °C began to rebound with increasing ACR, belonging to type II. After 300 °C, the ACR would not change the curves’ type, belonging to type I. The sensitivity of dynamic uniaxial compression strength (DUCS) and combined strength to temperature was consistent, but their sensitivity to ACR was different. Empirical equations for variations of strength with ACR and temperature indicated that same strength corresponded to multiple combinations of ACR and temperature, but samples’ crushing degree existed differences. As the ACR or temperature increased, the Ed climbed up and then declined. As the temperature rose or the ACR declined, the percentage of dissipated energy during sample failure increased. When the ACR was 0.8 and temperature was within 300 °C, the dissipated energy was negative, i.e., the sample released elastic strain energy for debris ejection instead of absorbing energy. When the temperature or ACR increased, mass of small-sized sample debris increased, and the crushing degree enhanced. Fractal dimension D well characterized the crushing degree of samples. Scanning electron microscope (SEM) images explained the diminishing mechanical properties of samples with increasing temperature. Results provided a reference for the construction of deep high-stress and high-temperature rock engineering.
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This work was supported by the National Natural Science Foundation of China (51927808, 52174098, 52374151).
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Wu, Y., Huang, L. & Li, X. Dynamic compression behaviors of heat-treated granite under combined dynamic and static load. Bull Eng Geol Environ 83, 199 (2024). https://doi.org/10.1007/s10064-024-03664-3
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DOI: https://doi.org/10.1007/s10064-024-03664-3