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

Table 1

Angles and lengths of 3D crack growth in tests.

Water pressure (MPa)	Initiation angle α (°)		Growth length ∆l (mm)			∆lB1/∆lA1
	αA1	αA2	∆lA1	∆lA2	∆lB1
0	70.8	71.1	10.2	9.4	0.2	0.020
2.0	66.0	67.0	8.5	8.1	0.5	0.059
4.0	51.9	54.6	7.1	7.0	0.9	0.127