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

Figure 11

Thermal imaging of the sample 11^#. Here, (a), (b), (c), (d), (e), and (f) are the thermal infrared imaging images of the sample 11^# at the rate of 0.05 MPa/s when the experimental times are 20 s, 40 s, 90 s, 130 s, 160 s, and 180 s, respectively. Among them, 160 s is the thermal infrared image after the confining pressure has just been unloaded.