In order to study the influence of high temperature on the mechanical characteristics and crack distribution of progressive failure process of rock, the laboratory uniaxial compression experiments were carried out on sandstone treated with different temperatures (25–1000 °C), and the variation characteristics of stress, deformation, and acoustic emission parameters during the failure of samples were analyzed. At the same time, the fracture crack distribution and fractal characteristics were analyzed through the industrial computed tomography (CT) test of the failure samples. The results show that temperature can affect the deformation and strength characteristics of rock. The stress thresholds and elastic modulus appear to increase when the preheating temperature increases from 25 to 400 °C and decrease when greater than 400 °C. The activity of AE signal is positively correlated with temperature. The CT results confirmed that with increasing temperature, the fracture cracks in the failure samples changed from a small number of single fracture cracks to a complex and crisscross distribution of small cracks. The failure cracks gradually gathered in the middle of the samples. The box-counting dimension of the fracture crack is between 1.4060 and 1.7262, and higher preheating temperature corresponds to the larger box-counting dimension, indicating that the temperature increases the complexity of the fracture crack. This outcome shows that temperature has an important influence on the deformation and failure of rock.

为了研究高温对岩石渐进破坏过程的力学特性和裂缝分布的影响，在不同温度（25–1000°C）下对砂岩进行了实验室单轴压缩实验，并研究了其变化特征。分析了样品破坏过程中的应力，变形和声发射参数。同时，通过失效样品的工业计算机断层扫描（CT）测试分析了裂缝的裂纹分布和分形特征。结果表明，温度会影响岩石的变形和强度特性。当预热温度从25升高到400°C时，应力阈值和弹性模量似乎会增加，而在高于400°C时，应力阈值和弹性模量会降低。AE信号的活性与温度呈正相关。CT结果证实，随着温度的升高，破坏样品中的断裂裂纹从少量的单个断裂裂纹变为复杂且纵横交错的小裂纹分布。破坏裂纹逐渐聚集在样品的中间。裂缝的盒数在1.4060和1.7262之间，较高的预热温度对应较大的盒数，表明温度增加了裂缝的复杂性。该结果表明温度对岩石的变形和破坏具有重要影响。破坏样本中的裂缝从少量的单个裂缝转变为复杂且纵横交错的小裂缝分布。破坏裂纹逐渐聚集在样品的中间。裂缝的盒数在1.4060和1.7262之间，较高的预热温度对应较大的盒数，表明温度增加了裂缝的复杂性。该结果表明温度对岩石的变形和破坏具有重要影响。破坏样本中的裂缝从少量的单个裂缝转变为复杂且纵横交错的小裂缝分布。破坏裂纹逐渐聚集在样品的中间。裂缝的盒数在1.4060和1.7262之间，较高的预热温度对应较大的盒数，表明温度增加了裂缝的复杂性。该结果表明温度对岩石的变形和破坏具有重要影响。较高的预热温度对应较大的盒数，表明温度增加了裂纹的复杂性。该结果表明温度对岩石的变形和破坏具有重要影响。较高的预热温度对应较大的盒数，表明温度增加了裂纹的复杂性。该结果表明温度对岩石的变形和破坏具有重要影响。