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

Table 1

Relationship between the ratio of stress intensity factor and the distance of cracks ().

Crack distance (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–
0.4	1.048	1.201	1.317	1.745
0.8	1.032	1.102	1.207	1.344
1.2	1.023	1.534	1.130	1.208
1.6	1.014	1.031	1.073	1.103
2.0	1.013	1.025	1.055	1.063
2.4	1.008	1.018	1.039	1.050
2.8	1.007	1.013	1.026	1.035