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岩石长期处于高温环境中,岩石内部结构会出现局部或整体破坏,导致岩石力学性能改变。针对高温环境中砂岩的热力学性质的变化规律,开展不同围压三轴压缩试验,试验结果表明:随着试验温度升高,岩石三轴抗压强度、弹性模量逐渐降低,降幅最大可达77.10%、71.61%,抗压强度、弹性模量与温度呈指数变化关系。围压强化岩石力学性质,随着围压升高,岩石抗压强度及弹性模量逐渐增大;根据三轴试验数据求得岩石的抗剪强度参数,岩石的内摩擦角与粘聚力随温度升高逐渐减小,损伤变量逐渐增大,内摩擦角及粘聚力与温度呈现对数变化关系。高温对岩体结构、强度产生损伤,研究成果对高温环境的岩体工程具有一定的参考价值。
Long-term high-temperature rock in the rock, the internal structure of the rock will be partial or overall damage, resulting in changes in rock mechanical properties. According to the variation law of the thermodynamic properties of sandstone in high temperature environment, the triaxial compression tests with different confining pressures were carried out. The results show that with the increase of test temperature, the triaxial compressive strength and elastic modulus of rock decrease gradually with the decreasing range up to 77.10 %, 71.61%, compressive strength, elastic modulus and temperature exponential relationship. The confining pressure intensifies the mechanical properties of the rock. With the increase of the confining pressure, the compressive strength and elastic modulus of the rock gradually increase. The shear strength parameters of the rock, the internal friction angle and the cohesion of the rock are obtained according to the triaxial test data The temperature increase gradually decreases, the damage variable increases gradually, and the internal friction angle and cohesion show a logarithmic change with temperature. High temperature damages the structure and strength of rock mass, and the research results have certain reference value for rock mass engineering in high temperature environment.