Coal and Rock Damage Energy Analysis and Relaxation Model

To study the dynamic disaster mechanism of coal and rock, we analyzed energy relation and stress-strain regulations in the process of coal and rock damage, and deduced the damage evolution differential equation. Aiming at the stress relaxation process, the relaxation theoretical model containing seven parameters for coal and rock was established, which was fitted with experimental data. The results show that the slip soil model parameter C=2,n=2.6，γ=0.6 MPa,E₀=1.7 MPa,k=3.6,l=7,j=1.1;the siltstone model parameter C=2,n=2,γ=0.41 MPa,E₀=19 900 MPa,k=3,l=1.15,j=1.08; the fitting match degree of experimental curve and theoretical curve is higher, and the model is validated.