Table 2 Unloading stress values for different fissure angles under 0.3 MPa confining pressure.

From: Mechanical behavior and reloading reinforcement characteristics of fractured coal under low confining pressure

Fissure angle/°

0°

15°

30°

45°

60°

Unloading stress/MPa

6.5

5.9

7

7.2

8

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