岩石加载破坏红外温度标准差指标分析

岩石受载破坏过程中,岩石表面温度场会随应力增加而发生变化。对完整红砂岩开展真三轴试验,含裂隙花岗岩开展单轴压缩试验,试验过程中采用红外热像仪对岩石表面进行全程监测,以获取岩石表面温度,并引入温度标准差指标,用温度标准差来反映岩石破坏过程中表面温度场变化特征,研究岩石破坏前温度标准差异常变化,以获取岩石破坏前温度标准差的异常变化特征,将这种异常变化作为岩石破坏的一种前兆信息。结果表明:岩石破坏前温度标准差会出现异常上升现象;含裂隙岩石的温度标准差敏感性远高于完整岩石;相较于温度曲线异常转折性变化,温度标准差异常出现时间更早且现象更明显。温度标准差异常反应作为岩石破坏的一种预警信息,为岩石破坏预警信息研究提供理论参考。

Research on Standard Deviation Index of Infrared Temperature for Rock Failure

During the process of rock failure under load, the temperature field of the rock surface will change with the increase of stress. In the article, a true triaxial test was carried out on the intact red sandstone, and a uniaxial compression test on the fractured granite was carried out. During the test, an infrared thermal imager was used to monitor the rock surface throughout the entire process, aims to obtain the temperature value of the rock surface. Introduce temperature standard deviation index, the temperature standard deviation is used to reflect the change characteristics of the surface temperature field in the process of rock failure, and the study focuses on the abnormal change of the temperature standard deviation before the rock failure. It is discovered from the experimental study that: The temperature standard deviation will rise abnormally before rock failure; The temperature standard deviation sensitivity of fractured rocks is much higher than that of intact rocks; Compared with the abnormal turning change of the temperature curve, the abnormal temperature standard deviation appears earlier and the phenomenon is more obvious. Temperature standard deviation abnormal response as an early warning information of rock failure, provide theoretical reference for the study of rock failure warning information.