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高温环境中,岩石结构的渐变或突变导致岩石力学性质的变化。对经历高温环境的岩石进行轴向压缩试验,结果表明:岩石单轴抗压强度、弹性模量随温度升高呈现负指数规律减小,岩石的软化系数及弹性模量劣化度随温度升高逐渐增大;岩石的抗剪强度参数随温度升高逐渐减小,分析粘聚力、内摩擦角与温度变化规律,可表征为三次多项式变化关系。为定量分析岩石力学性质的热损伤特征,分别求得岩石抗剪强度参数损伤变量,损伤变量值随温度升高而逐渐增大。高温对岩石的力学性质产生明显的损伤,研究成果可以为高温环境岩体失稳预测分析提供依据。
In high temperature environment, the gradual change or change of rock structure leads to the change of rock mechanical properties. The results show that the uniaxial compressive strength and elastic modulus of rock exhibit a negative exponential law with the increase of temperature, the softening coefficient and the modulus of elasticity of rock decrease with increasing temperature The shear strength of rock decreases with increasing temperature, and the variation regularity of cohesion, internal friction angle and temperature can be characterized as cubic polynomial change. In order to quantitatively analyze the thermal damage characteristics of rock mechanics properties, the parameters of rock shear strength parameters were obtained respectively, and the damage variable values gradually increased with the increase of temperature. The high temperature causes obvious damage to the mechanical properties of rock, and the research results can provide the basis for the prediction and analysis of rock instability in high temperature environment.