中文摘要：

通过实时高温（常温～850℃）加载和高温（常温～1200℃）后冷却再加载两种情况下的单轴压缩试验，对不同高温下化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，并研究了热一力耦合效应。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牛连续劣化；（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…明显的塑性；（5）提出了热一力祸合因子的概念，并借助其提出了一维非线性热一力耦合本构模型，模型曲线和试验曲线较吻合。

英文摘要：

According to experiments on granite under uniaxial compression at high temperatures （normal to 850 ℃） and after high temperatures （normal to l 200 ℃） cooling and reloading, the mechanical properties of granite have been researched. The variations of uniaxial compressive strength, elastic modulus, longitudinal wave velocity, cut-slip strain with temperature are analyzed; then the effects of thermo-mechanical coupling are studied. Some results are achieved： （1） The peak strength and elastic modulus decrease continuously at high temperature. （2） Reloading after high temperature, the strength changes little from 25 ℃ to 600 ℃, then decreases suddenly at about 800 ℃. （3） The longitudinal wave velocity decreases gradually as temperature rises. （4） The cut-slip strain is small, and varies little below 800 ℃, then increases rapidly and the granite presents distinct plastic behavior over 800 ℃. （5） Based on the proposed concept of thermo-mechanical coupled factor, one-dimensional nonlinear thermo-mechanical coupled damage constitutive eouation is established;and model curves are in agreement with ezperimental curves.