Temperature can affect the physical and mechanical properties of rocks. With the aim of better understanding the effect of thermally-induced cracks on rock failure process, we heated granite disks (up to 800 °C) to induce different degrees of thermal damage, which were then used for Brazilian tests. The acoustic emission (AE) technique was applied to collect AE signals throughout each test. Specifically, the effect of thermally-induced cracks on AE characteristics (AE spatio-temporal characteristics, damage parameters D_AE, amplitude-frequency characteristics, and b-value) was studied. Our results show that the thermally-induced cracks increase with the treated temperature, leading to more AE damage occurring at the early stage of the loading process. The existence of a large amount of thermally-induced cracks causes the scattered AE distribution on the disks treated at 600 °C and 800 °C. The average dominant frequency of AE signals decreases with the treated temperature. The decreasing of high-frequency signals and the increasing of low-frequency signals can be explained by the different mechanisms of thermally-induced cracks and stress-induced cracks. The b-value increases with treated temperature and decreases with the increasing applied stress.

温度会影响岩石的物理和机械特性。为了更好地了解热致裂纹对岩石破坏过程的影响，我们加热花岗岩盘（高达 800 °C）以诱导不同程度的热损伤，然后将其用于巴西试验。声发射 (AE) 技术用于在每次测试中收集 AE 信号。具体而言，热致裂纹对 AE 特性（AE 时空特性、损伤参数D _AE、幅频特性和b-值）进行了研究。我们的结果表明，热致裂纹随着处理温度的增加而增加，导致在加载过程的早期阶段发生更多的 AE 损伤。大量热致裂纹的存在导致在 600°C 和 800°C 处理的圆盘上出现散射的 AE 分布。AE 信号的平均主频率随着处理温度而降低。高频信号的减少和低频信号的增加可以用热致裂纹和应力诱导裂纹的不同机制来解释。的b与处理温度-值增加，日益增加的施加的应力减小。