Multifield Coupling Mechanism of Unloading Deformation and Fracture of Composite Coal-Rock

Figure 13

(a) and (b) show the electromagnetic radiation intensity, temperature, and stress curves of the specimens unloading confining pressure at the rate of 0.05 MPa/s and 0.2 MPa/s at the same 10 MPa confining pressure, respectively.

(a)

(b)