A Time-Dependent Creep Constitutive Model of Deep Surrounding Rock under Temperature-Stress Coupling

Table 1

Fitting values of creep parameters.

σ1 (MPa)	50	60	70	80
G0 (GPa)	8.588	8.411	7.661	7.346
K (GPa)	7.188	7.030	6.409	5.157
G1 (GPa)	12.966	12.700	11.566	11.083
η1 (GPa·h)	914.594	1181.396	1421.250	1966.222
η2 (GPa·h)	—	9833.979	12079.614	16337.142
α0	1.440	1.203	0.917	0.740
α1	2.041	2.002	1.795	1.696
α2	—	0.454	0.493	0.740
a0	0.030	0.069	0.118	0.227
a1	0.108	0.237	0.316	0.454
a2	0.513	0.562	0.641	0.769
b0	0.897	1.006	1.163	1.449
b1	0.375	0.404	0.572	0.828
b2	—	0.878	0.937	1.075
c0	0.404	0.552	0.878	1.380
c1	1.400	1.637	1.933	2.258
c2	—	0.878	1.321	1.893
R^2	0.975	0.987	0.951	0.923