A Simple Three-Dimensional Failure Criterion for Jointed Rock Masses under True Triaxial Compression

Table 2

Percentage error in predicting strength data of jointed marble.

σ3 (MPa)	σ2 (MPa)	Percentage error in predicting strength data at joint inclination angle β (°)
		0	20	40	60	80	90
0	0	7.79	9.30	10.91	8.69	5.16	2.52
10	60	1.15	14.24	19.13	15.75	7.44	6.84
30	60	6.66	6.05	3.39	0.84	11.19	14.87
30	90	3.54	0.61	0.08	0.02	6.14	11.45
30	120	13.14	14.95	13.35	7.09	10.46	12.89
Average of this paper		6.46	9.03	9.37	6.48	8.08	9.71
Average of the Mogi–Coulomb criterion [17]		4.88	10.43	11.80	8.52	9.17	11.57