Multiscale study of microstructural and energy evolution characteristics of granite under ultra-high temperature conditions
LIU Liyuan1, 2, LUO Shengwen1, 3, WANG Tao1, 3, LUO Yifan4, JIANG Naisheng5
(1. Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. School of Resources and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. Future City College, University of Science and Technology Beijing, Beijing 100083, China; 4. Deep Mining Laboratory of Shandong Gold Group Co., Ltd., Yantai, Shandong 261400, China; 5. School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China)
Abstract：To investigate the microstructural evolution and strength degradation mechanisms of granite under ultra-high-temperature conditions (up to 1 000 ℃), this study employs a comprehensive suite of multi-scale characterization techniques, including nuclear magnetic resonance (NMR), micro-CT three-dimensional reconstruction, scanning electron microscopy (SEM), and rock mechanics testing. These methods systematically analyze the microstructural evolution characteristics of granite at elevated temperatures and their impacts on mechanical properties. Additionally, the energy evolution process of granite is examined based on energy dissipation theory. The results indicate that the porosity of granite initially increases slowly and then rapidly with rising temperature. Specifically, higher temperatures correlate with a more pronounced increase in porosity, with 400 ℃ identified as the threshold temperature at which significant changes occur. CT scanning results reveal that the internal pores of granite continuously develop and expand due to temperature effects, ultimately connecting to form fractures. SEM analysis demonstrates that noticeable crack formation initiates within granite at 400 ℃ and further propagates as the temperature increases. Under both uniaxial and triaxial compression conditions, the total strain energy consistently decreases with rising temperature, with a brittle-ductile transition occurring between 600 ℃ and 800 ℃. Temperature exhibits a strong correlation with peak strain, peak stress, porosity, and total strain energy. This research elucidates the internal microstructural changes and energy evolution of granite at high temperatures, providing valuable insights into the damage evolution mechanisms of rocks subjected to elevated thermal conditions.
刘力源1，2，罗胜文1，3，王 涛1，3，骆奕帆4，姜乃生5. 超高温下花岗岩微观结构与能量演化特征的多尺度研究[J]. 岩石力学与工程学报, 2025, 44(9): 2305-2320.
LIU Liyuan1, 2, LUO Shengwen1, 3, WANG Tao1, 3, LUO Yifan4, JIANG Naisheng5. Multiscale study of microstructural and energy evolution characteristics of granite under ultra-high temperature conditions. , 2025, 44(9): 2305-2320.
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2025, Vol. 44 
