Mechanisms of Crack Initiation and Propagation in Dense Linear Multihole Directional Hydraulic Fracturing

Table 2

Experimental scheme.

No.	Principal stress (MPa)	Borehole spacing D (mm)	Arrangement angle of boreholes θ (deg)
A	σ1 = 6, σ2 = 5, σ3 = 4	141	15
B	σ1 = 6, σ2 = 5, σ3 = 2	141	15
C	σ1 = 6, σ2 = 5, σ3 = 2	282	15