Table 4 Calculated strength parameters of high-temperature initially damaged rock specimens.

From: Experimental study of strength degradation in fractured surrounding rock of deep high-temperature tunnels

Rock specimen number

Cohesion, c/MPa

Internal friction angle, φ/(°)

C1 intact rock specimen

17.31

28.54

C2 rock specimen (T = 150 °C)

14.07

22.58

C3 rock specimen (T = 300 °C)

9.65

22.85

C4 rock specimen (T = 400 °C)

7.61

21.88

C5 rock specimen (T = 500 °C)

5.04

20.31

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