An Experimental and Numerical Investigation on the Initiation and Interaction of Double Cracks in Rocks under Hydromechanical Coupling

Table 2

Angles and lengths of double cracks simulated using the modified energy release rate criterion.

Water pressure (MPa)	Initiation angle α (°)		Growth length ∆l (mm)			∆lB1/∆lA1
	αA1	αA2	∆lA1	∆lA2	∆lB1
0	71.20	71.80	9.93	9.43	0.196	0.020
2.0	66.57	67.17	8.34	8.12	0.518	0.062
4.0	51.85	55.21	6.99	6.93	0.940	0.134