Unloading-Induced Crack Propagation of Two Collinear Unequal Length Flaws in Brittle Rocks

Table 3

Relationship between the ratio of stress intensity factor and the length of secondary crack .

The length of secondary crack (mm)	The ratio of stress intensity factor–	The ratio of stress intensity factor–	The ratio of stress intensity factor–	The ratio of stress intensity factor–
0.1	0.972	1.005	1.183	1.247
0.2	0.987	1.016	1.122	1.163
0.3	1.004	1.038	1.103	1.148
0.4	1.025	1.062	1.085	1.120
0.5	1.043	1.094	1.069	1.108
0.6	1.085	1.139	1.083	1.138