Fig 1.
Schematic diagram of rock samples.
Table 1.
Mean values of physical parameters of rock samples.
Fig 2.
Graded loading creep stress loading level.
Fig 3.
Rock mechanics testing machine.
Fig 4.
Clusters of creep curves under different freeze-thaw cycles.
(a) Rock sample without freeze-thaw cycles. (b) Rock sample after 30 freeze-thaw cycles.(c) Rock sample after 60 freeze-thaw cycles.(d) Rock sample after 90 freeze-thaw cycles.
Fig 5.
The variation of instantaneous strain with the number of freeze-thaw cycles.
(a) Intact rock specimens. (b) Slow-slow fissures.
Fig 6.
The variation of creep strain with the number of freeze-thaw cycles.
(a) Intact rock specimens. (b) Slow-slow fissures.
Fig 7.
Variation of creep strain rate of rock samples with the number of freeze-thaw cycles.
Fig 8.
Creep curve clusters of rock samples with different fracture dip angles.
(a) Slow-slow rock sample. (b) Slow-steep rock samples. (c) Steep-steep rock samples.
Fig 9.
The variation of instantaneous strain of rock samples with different dip angles of double fissures with stress level.
(a) Freeze-thaw 0 times. (b) Freeze-thaw 90 times.
Fig 10.
The variation of creep strain of rock samples with different dip angles of double fissures with stress level.
(a) Freeze-thaw 0 times. (b) Freeze-thaw 90 times.
Table 2.
Steady-state creep rate of rock samples under different crack dip angles.
Fig 11.
Creep failure mode and sketch map of slow-slow fractured rock.
(a) 0 times. (b) 30 times. (c) 60 times. (d) 90 times.
Fig 12.
Creep failure mode and sketch map of slow-step fractured rock.
(a) 0 times. (b) 30 times. (c) 60 times. (d) 90 times.
Fig 13.
Creep failure mode and sketch map of step-step fractured rock.
(a) 0 times. (b) 30 times. (c) 60 times. (d) 90 times.
Fig 14.
Creep failure morphology and sketch map of intact rock.
(a) 0 times. (b) 30 times. (c) 60 times. (d) 90 times.
Fig 15.
Relationship between axial strain and time curve.
(a) Slow-slow rock sample. (b) Slow-step rock sample. (c) Step-step rock sample. (d) Intact rock sample.
Fig 16.
Creep long-term strength of intact rock samples under different freeze-thaw cycles.
(a) Freeze-thaw 0 times rock sample. (b) Freeze-thaw 30 times rock sample. (c) Freeze-thaw 60 times rock sample. (d) Freeze-thaw 90 times rock sample.
Fig 17.
Long-term creep strength of three kinds of double-fractured rock samples.
(a) Slow-slow rock sample. (b) Slow-steep rock samples. (c) Steep-steep rock samples.