中文摘要：

为了得到高温高应力下岩石的动态力学性能，对其进行冲击加载实验。对SHPB实验系统进行改进，使该系统能够实现温度与轴压共同作用下的冲击加载实验。采用扫描电子显微镜观察花岗岩碎片的内部结构特征。研究结果表明：花岗岩的纵波波速随温度的升高呈下降趋势，先快速后缓慢下降；花岗岩的单轴动态抗压强度随温度的升高呈下降趋势，其值在25~100°C比在100~300°C时下降得更加明显；峰值应变则随温度的升高而逐渐增大，同样以100°C为分界点，先快速后缓慢增加；随着温度的增加，花岗岩内部发生了巨大的变化，如原生裂纹和新生裂纹的扩展和贯通。另外，轴压下的热损伤比以波速表征的热损伤大，特别是随着温度的增加，这种现象更加明显。

英文摘要：

In order to get the dynamic mechanical properties of deep rock mass suffered both high temperature and high pressure,impact loading experiments on granite subjected to temperature and axial pressure were carried out. Furthermore, the internalstructure characteristics of granite under different temperatures were observed by scanning electron microscopy (SEM). The results show that the longitudinal wave velocity assumes a downward trend which shows a rapid drop before falling slowly as the temperature increases. The uniaxial compressive strength of the specimen decreases significantly at temperatures of 25?100 °C compared to that at temperatures of 100?300 °C. The peak strain rises rapidly before the dividing point of 100 °C, but increases slowly after the dividing point. The internal structure of the rock changes substantially as the temperature increases, such as the extension and transfixion of primary and newborn cracks. In addition, the thermal damage under axial pressure is greater than that described by the longitudinal wave velocity and the phenomenon shows obviously when the temperature increases.