A Nonlinear Creep Damage Model of Layered Rock under Unloading Condition

Table 2

Creep parameters of rock under different confining pressures.

Confining pressure/MPa	/GPa	K/GPa	/(GPa⋅d)	/GPa	/(GPa⋅d)
	Axial Burgers creep model parameters (deviatoric stress 60 MPa)
40	23.86	36.46	4.56 × 10^3	5.53 × 10^2	35.28	0.952
35	20.50	33.71	1.60 × 10^3	1.10 × 10^3	89.63	0.991
30	19.20	30.40	1.02 × 10^3	2.42 × 10^2	30.29	0.989
25	16.72	29.23	8.19 × 10^2	1.29 × 10^3	160.28	0.991
20	14.99	27.73	5.54 × 10^2	4.33 × 10^2	2.24	0.987
15	13.35	25.06	4.32 × 10^2	1.90 × 10^2	150.55	0.996
	Lateral Burgers creep model parameters (deviatoric stress 60 MPa)
40	18.32	27.47	1.21 × 10^3	5.98 × 10^3	368.21	0.941
35	16.03	24.04	6.09 × 10^2	7.71 × 10^2	65.21	0.968
30	14.25	21.37	5.37 × 10^2	3.15 × 10^3	399.31	0.934
25	12.09	18.14	4.17 × 10^2	2.45 × 10^3	325.40	0.908
20	9.71	14.57	2.33 × 10^2	5.46 × 10^2	28.24	0.913
15	8.43	12.65	1.29 × 10^2	3.24 × 10^2	256.73	0.903