Study on thermal image evolution characteristics of silt sandstone under uniaxial compression based on euclidean distance

In order to explore the infrared anomaly in the process of siltstone failure, the method of Euclidean distance was introduced. By calculating the Euclidean distance of siltstone samples, the evolution characteristics of siltstone infrared radiation temperature field under uniaxial compression were studied. Entropy and variance are used to verify the availability of Euclidean distance method. The results show that the Euclidean distance, the entropy method and the variance can describe the different stages of the infrared radiation temperature field of siltstone well. From the compaction stage to the early stage of the elastic stage, the Euclidean distance has a large sudden rise value, The Euclidean distance is similar to the entropy value and the variance characterization. In the late stage of elasticity to the plastic stage, the Euclidean distance is relatively smooth and alternated alternately, which indicates that the fracture is stable and stable. And the range and frequency are larger than those in the previous stage, which indicate that the siltstone sample is about to burst, and the Euclidean distance characterization is better than the entropy value, variance.