Table 3 Fracture initiation angle of rock mass with different fracture dip angle.

From: Stability of surrounding rock in roadways with fractured rock mass: mechanisms and effects of layout optimization

Fissure inclination angle (°)

Theoretical initiation angle (°)

Experimental initiation angle (°)

Simulated fracture angle (°)

0

/

90

/

15

94.6

94

96

30

81.8

79

80

45

77

77

75

60

74.2

74

74

75

72.5

73

72

90

/

90

/

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