Parallel Offset Crack Interactions in Rock under Unloading Conditions

Table 5

Geometric parameters of cracks in specimens.

Specimen number	Incline angle (α) (°)	Length of Crack 1 (2a) (mm)	Length of Crack 2 (2b) (mm)	Length of rock bridge (s) (mm)	Staggered distance (h) (mm)
1	45	12	24	−12	6
2	45	12	24	−12	12
3	45	12	24	−12	24
4	45	12	24	12	6
5	30	12	24	12	6
6	75	12	24	12	6

When s is negative, it indicates that there is an overlap between the cracks.