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通过实时高温(常温～850℃)加载和高温(常温～1 200℃)后冷却再加载两种情况下的单轴压缩试验,对不同高温下花岗岩的力学性质进行了研究,分析了两种情况下单轴抗压强度、弹性模量、纵波波速、剪切滑移应变等随温度的变化规律,并研究了热-力耦合效应。研究结果表明:(1)在实时高温加载作用下单轴抗压强度和弹性模量随着温度升高而发生连续劣化;(2)高温作用冷却后再加载,花岗岩在常温～600℃区间峰值强度变化不大,800℃左右岩样强度突然降低;(3)纵波波速随加热温度的升高而逐渐降低;(4)剪切滑移应变在800℃之前相对较小,且变化不大,之后便迅速增大,表现出明显的塑性;(5)提出了热-力耦合因子的概念,并借助其提出了一维非线性热-力耦合本构模型,模型曲线和试验曲线较吻合。
The mechanical properties of granite at different temperatures were studied by uniaxial compression tests under real-time high temperature (normal temperature ~ 850 ℃) loading and high temperature (normal temperature ~ 1200 ℃) cooling and reloading. The two cases Under uniaxial compressive strength, elastic modulus, longitudinal wave velocity, shear slip strain and other changes with temperature, and the thermo-mechanical coupling effect. The results show that: (1) the uniaxial compressive strength and elastic modulus of the granite continuously deteriorate with the temperature increase under the real-time high temperature loading; (2) (3) The longitudinal wave velocity decreases gradually with the increase of heating temperature; (4) The shear slip strain is relatively small before 800 ℃, with little change, (5) The concept of heat-force coupling factor is proposed, and a one-dimensional nonlinear thermo-mechanical coupling constitutive model is proposed. The model curves are in good agreement with the experimental curves.