Fig 1.
Maxwell ‘s body physical model.
Fig 2.
Stress relaxation curves in different situations:(A)different time-fractal parameter α1. (B)different initial stress value σ0.
Fig 3.
Improved rock stress relaxation model.
Fig 4.
Axial stress-strain curves of rocks.
Fig 5.
Stress relaxation test curves.
Table 1.
Parameters of improved rock stress relaxation model.
Fig 6.
Stress relaxation test curve and model curve.
Fig 7.
Comparison of rock stress relaxation model curve and test curve before and after improvement:(A)Uniaxial, strain 1.20%.
(B) Uniaxial, strain 1.38%.
Fig 8.
Stress relaxation curves of rock under different parameters E2.
Fig 9.
Stress relaxation curves of rock under different parameters E1.
Fig 10.
Stress relaxation curves of rock under different parameters η1.
Fig 11.
Stress relaxation curves of rock under different parameters α2.