Parametric Study of the Borehole Drilling in Jointed Rock Mass

Table 4

The maximum shear stress around the borehole (MPa).

Number of joints	Joint angle
	0°	15°	30°	45°	60°	75°
1	33.6	33.0	31.6	29.3	27.5	27.0
2	33.6	33.0	31.4	28.3	26.4	28.6
3	33.2	33.1	32.0	27.8	25.8	27.1
4	33.3	33.0	31.8	26.5	25.3	26.6
5	32.7	33.9	32.2	27.7	24.8	27.0
6	32.8	34.2	32.1	26.0	24.0	26.8
7	32.5	34.6	32.4	24.9	23.8	26.5