Abstract
To study the damage mechanisms of anhydrite rock under freeze-thaw cycles, the physical-mechanical properties and the microcracking activities of anhydrite rock were investigated through mass variation, nuclear magnetic resonance, scanning electron microscope tests, and uniaxial compression combined with acoustic emission (AE) tests. Results show that with the increase of freeze-thaw processes, the mass, uniaxial compression strength, and elastic modulus of the anhydrite specimens decrease while the porosity and plasticity characteristics increase. For example, after 120 cycles, the uniaxial compression strength and elastic modulus decrease by 46.54% and 60.16%, and the porosity increase by 75%. Combined with the evolution trend of stressstrain curves and the detected events, three stages were labeled to investigate the AE characteristics in freeze-thaw weathered anhydrite rock. It is found that with the increase of freeze-thaw cycles, the proportions of AE counts in stage I and stage II show a decaying exponential trend. Contrarily, the proportion of AE counts in stage III displays an exponential ascending trend. Meanwhile, as the freeze-thaw cycles increase, the low-frequency AE signals increase while the intermediate-frequency AE signals decrease. After 120 cycles, the proportion of low-frequency AE signals increases by 168.95%, and the proportion of intermediate-frequency AE signals reduces by 81.14%. It is concluded that the micro-tensile cracking events occupy a dominant position during the loading process. With the increase of freeze-thaw cycles, the b value of samples decreases. After 120 cycles, b value decreases by 27.2%, which means that the proportion of cracking events in rocks with small amplitude decreases. Finally, it is proposed that the freeze-thaw damage mechanism of anhydrite is also characterized by the water chemical softening effect.
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Acknowledgments
This study was financially supported by the Fundamental Research Funds for the Central Universities (Project No. 2022CDJKYJH037) and the National Key R&D Program of China (Grant No. 2021YFB3901402). These supports are gratefully acknowledged.
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Zhang, C., **, Xg., Hou, C. et al. Mechanical and acoustic emission characteristics of anhydrite rock under freeze-thaw cycles. J. Mt. Sci. 20, 227–241 (2023). https://doi.org/10.1007/s11629-022-7661-6
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DOI: https://doi.org/10.1007/s11629-022-7661-6