Damage Characteristics of Prefabricated Fractured Granite after High Temperature
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摘要: 温度是影响岩石物理力学性质的重要因素之一。研究高温对岩石力学性质演变规律及损伤破坏机制的影响，对深部岩体工程具有重要意义。基于PFC颗粒流数值模拟方法，建立了含预制裂纹花岗岩数值模型，模拟了不同温度（20 ℃，200 ℃，400 ℃，600 ℃，800 ℃）处理后含预制裂纹花岗岩单轴压缩试验。研究结果表明，含预制裂纹花岗岩的峰值强度和弹性模量随着热处理温度的升高显著降低，而峰值应变呈现增加趋势；不同热处理温度造成的热损伤程度不同，导致预制裂纹花岗岩宏观破坏模式存在差异；热处理温度不超过600 ℃时，花岗岩均沿着预制裂纹两端发生破坏；当热处理温度达到800 ℃，热损伤成为花岗岩力学破坏模式的主导因素，且破碎程度显著增加。研究成果有助于了解高温作用下的岩石损伤演化机理，可为深部地下工程提供借鉴。Abstract: Temperature is one of the important factors affecting the physical and mechanical properties of rock. The study of the influence of high temperature on the evolution of rock mechanical properties and damage mechanism is of great significance in the construction of deep rock mass engineering. Based on the PFC particle flow numerical simulation method, the uniaxial compression experiments of pre-existing flaws granite treated at different temperatures (20 ℃,200 ℃,400 ℃,600 ℃,800 ℃) were simulated. The results show that the peak strength and elastic modulus of granite decrease significantly with the increase of heat treatment temperature, while the peak strain increases. The degree of thermal damage caused by different heat treatment temperatures varies, leading to differences in macroscopic failure modes of prefabricated fractured granite. When the heat treatment temperature does not exceed 600 ℃, the granite undergoes failure along both ends of the prefabricated crack; When the heat treatment temperature reaches 800 ℃, thermal damage becomes the dominant factor in the mechanical failure mode of granite, and the degree of fragmentation significantly increases. The research results contribute to understanding the mechanism of rock damage evolution under high temperature, and can provide reference for deep underground engineering.
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Key words:
- granite /
- high temperature treatment /
- prefabricated crack /
- particle flow /
- thermal damage
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表 1 模型细观物理力学参数
颗粒密度
/(kg·m−3)颗粒模量
/GPa颗粒摩擦
因数平行黏结
模量/GPa平行黏结
刚度比法向强度
/MPa切向强度
/MPa摩擦
系数2730 2.30 0.45 2.30 2.0 11.0 15.0 0.45 
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表 2 模型热物性参数
热导率
/(W·m−1·K−1)比热
/(J·kg−1·K−1)石英
热膨胀
系数/K−1钠长石
热膨胀
系数/K−1白云母
热膨胀
系数/K−13.5 1015 24.3 14.1 3.0
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