高温损伤花岗岩细观结构演化试验研究

doi:10.13722/j.cnki.jrme.2024.0297

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摘要了解高温损伤花岗岩细观结构演化对于揭示其宏观物理力学性质劣化机制至关重要。首先对花岗岩进行高温(25 ℃，100 ℃，200 ℃，300 ℃，400 ℃，500℃和600 ℃)处理，然后对热处理后的花岗岩进行单轴压缩试验，最后利用光学显微镜、CT扫描和核磁共振技术定性和定量分析花岗岩的细观热损伤特征。结果表明，花岗岩的力学性质与温度密切相关，抗压强度随温度的升高呈先增大后减小趋势，200 ℃是热强化效应的峰值温度，400 ℃是花岗岩细观结构损伤的阈值温度，600 ℃是花岗岩脆延性转变的阈值温度。进一步分析表明，在25 ℃～200 ℃温度范围内，高温导致花岗岩结构更加致密，孔隙率随温度升高而减小。300 ℃后，可以在花岗岩内部观察到热致裂纹的萌生和扩展，这些裂纹从孤立的分布在试件边缘向内部扩展，孔隙数量随温度升高而增加，以中孔和大孔为主，孔隙率随温度呈指数函数增加。此外，微孔的分形维数随温度升高而减小，意味着高温简化微孔的孔隙结构，而中孔和大孔表现出良好的分形特征，不受温度影响。

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	卜墨华1
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	郭平业1
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	金鑫1
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	何满潮1
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	王嘉敏3

关键词 ：岩石力学, 花岗岩, 高温, 热致裂纹, 孔隙结构

Abstract：Understanding the mesostructural evolution of high-temperature damaged granite is crucial to reveal the degradation mechanism of its macro-physical and mechanical properties. In this study，granite was treated at high temperature(25 ℃，100 ℃，200 ℃，300 ℃，400 ℃，500 ℃ and 600 ℃)，and then the uniaxial compression test was carried out on the thermal-treated granite. Finally，the meso-structure of granite was qualitatively and quantitatively analyzed using optical microscope，CT scanning and nuclear magnetic resonance(NMR). The results indicate that the mechanical properties of granite are strongly dependent on temperature，and the compressive strength increases at first and then decreases with the temperature. 200 ℃ is the peak temperature of thermal strengthening effect，400 ℃ is the threshold temperature for meso structural damage of granite，and 600 ℃ is the threshold temperature of brittle-ductile transition of granite. Further analysis indicates that the high temperature leads to a denser structure of granite and the porosity decreases with temperature at 25 ℃–200 ℃. The initiation and propagation of thermally-induced cracks can be observed in granite after 300 ℃. These cracks propagate from the edge to the interior of the specimen，and the number of pores increases with the temperature，and mesopore and macropores are dominant. The porosity increases exponentially with temperature. In addition，the fractal dimension of micropores decreases with temperature，which means that high temperature simplifies the structure of micropores，while mesopores and macropores show good fractal characteristics and are not affected by temperature.

Key words： rock mechanics granite high temperature thermally-induced cracks pore structure

引用本文:

卜墨华1，2，郭平业1，2，金鑫1，2，何满潮1，2，王嘉敏3. 高温损伤花岗岩细观结构演化试验研究[J]. 岩石力学与工程学报, 2024, 43(11): 2639-2654.
BU Mohua1，2，GUO Pingye1，2，JIN Xin1，2，HE Manchao1，2，WANG Jiamin3. Experimental study on evolution of meso-structure of granite subjected to high temperature. , 2024, 43(11): 2639-2654.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0297 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I11/2639

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