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Deformation characteristics of granites at different unloading rates after high-temperature treatment

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Abstract

Naturally cooled granite specimens pretreated at 800 °C were separately subjected to conventional triaxial compression tests and triaxial confining pressure unloading tests under a constant deviatoric stress. Via these tests, the deformation characteristics of granite at different confining pressure unloading rates were explored. The research results showed that the granite specimens were more easily damaged at an intermediate unloading rate than at a high or low unloading rate. The strain–confining pressure compliance results quantitatively revealed that rock failure during unloading was caused by intense radial deformation and volumetric dilatancy. With the increase in the unloading rate, the strain–confining pressure compliance first increased and then decreased. In the confining pressure unloading process, initially, the elastic modulus of the rocks linearly decreased with the decreasing confining pressure. In the case that the confining pressure was unloaded to the critical point where rock failure occurred, the elastic modulus of the rocks dramatically decreased. Additionally, Poisson’s ratio gradually decreased with the reduction in confining pressure. However, approaching the critical point where rock failure occurred during unloading, Poisson’s ratio remarkably decreased. Afterwards, Poisson’s ratio increased to 0.5 and then remained unchanged until the specimens became damaged.

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Acknowledgements

This work was funded by the State Key Research Development Program of China (2017YFC0804206), National Natural Science Foundation of China (51974043, 51704046, and 51774058), the Chongqing Basic Research and Frontier Exploration Project (cstc2018jcyjA3320), and the Research Fund of the State Key Laboratory of Coal Resources and Safe Mining, CUMT (SKLCRSM18KF025), which are gratefully acknowledged. The authors also thank the editor and anonymous reviewers for their valuable advice.

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  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental Science, Chongqing University, Chongqing, 400044, China

    Peng Kang, Zhang Jing, Zou Quanle & Song Xiao

  2. State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou, 221006, China

    Peng Kang

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  1. Peng Kang
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  2. Zhang Jing
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  3. Zou Quanle
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  4. Song Xiao
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Correspondence to Peng Kang or Zou Quanle.

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Kang, P., Jing, Z., Quanle, Z. et al. Deformation characteristics of granites at different unloading rates after high-temperature treatment. Environ Earth Sci 79, 343 (2020). https://doi.org/10.1007/s12665-020-09088-y

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