Abstract
The stability of rock masses in regions is significantly affected by freeze–thaw and load, so it is necessary to study the mechanical characteristics of rock under freeze–thaw conditions. To investigate the strength degradation characteristics of water-saturated red sandstone, the mechanical properties and damage mechanisms were analyzed under freeze–thaw and triaxial load conditions. The results shows: The damage caused by freeze–thaw cycles is mainly concentrated on the side and edge area of rock samples. With the increase of the number of freeze–thaw cycles, the more serious and obvious is the failure and strength degradation. The number of secondary cracks after failure increases significantly and multiple groups of conjugate shear cracks are formed. With the increase of confining pressure, the damage accumulation rate of rock decreases with the increase of strain, and the rock gradually appears hardening characteristics. The failure mode of saturated sandstone gradually changes from splitting type to multi shear type and "X" conjugate shear type. The damage evolution equation considering the coupling effect of freeze–thaw and load is established, and the parameters of the model are identified and analyzed using the test data, which verifies the correctness of the model. The results of the study provide important reference for the evaluation of geotechnical stability in cold regions.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant no. 11872299; and Grant no. 12072259) and the coal union foundation of Shaanxi Natural Science Foundation (Grant no. 2019JLP-01). This work was completed in the college of architecture and civil engineering, Xi'an University of science and technology. We should thank our professors for their support and help in this project. At the same time, I would like to thank my colleagues for their continuous efforts in their work.
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Ren, JX., Yun, MC., Cao, XT. et al. Study on the mechanical properties of saturated red sandstone under freeze–thaw conditions. Environ Earth Sci 81, 376 (2022). https://doi.org/10.1007/s12665-022-10503-9
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DOI: https://doi.org/10.1007/s12665-022-10503-9