Table 2 Calculation result of S11/G1.

From: Determination of the parameters of rock viscoelastic creep model and analysis of parameter degradation

Stress level/MPa

50

60

70

80

a4

 − 5.743

 − 16.211

 − 35.647

 − 63.886

b4

30.442

16.061

14.447

15.958

c4

20.770

28.940

42.295

62.834

R2

0.943

0.992

0.987

0.977

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