Table 4 Crack initiation Angle of upper wing and lower wing.

From: Analysis on characteristics and mechanism for rock fracture in deep rock with cracks under dynamic-static coupling effect

Pre-existing crack inclination angle (β)/°

0

30

60

90

Crack initiation angle of upper wing(α1)/°

82.875

59.140

45.862

12.053

Crack initiation angle of lower wing(α2)/°

81.959

66.500

38.083

7.300

Back to article page