Variation Law of Infrared Radiation Temperature of Unloading Fracture of Composite Coal-Rock

Figure 4

- curves of thermal infrared radiation at different confining pressure unloading rates. Under the confining pressure of 10 MPa and the unloading rates of 0.003 MPa/s, 0.03 MPa/s, and 0.05 MPa/s, the temperature changes during the triaxial loading-unloading process of composite coal were compared, and the confining pressure unloading time was 142.5 s.