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

Table 4

Percentage error in predicting strength data of rock mass models.

σ3 (MPa)	σ2 (MPa)	Percentage error in predicting strength data at joint inclination angle β (°)
		0	20	40	60	80	90
0.31	0.31	0.06	2.90	1.52	1.77	3.52	3.35
0.31	0.59	4.62	0.77	27.55	20.33	15.56	11.79
0.31	0.95	2.83	4.42	33.43	28.01	16.94	2.72
0.31	1.22	13.15	15.50	29.41	32.63	17.32	13.89
0.31	1.62	10.59	20.49	21.95	58.92	12.89	6.40
0.78	0.78	0.01	3.35	1.35	2.01	4.41	5.35
0.78	1.22	0.75	10.35	19.07	17.79	2.68	3.19
0.78	2.24	1.88	5.42	11.68	33.63	6.73	0.25
1.22	1.22	0.05	1.44	0.56	0.68	2.00	1.97
Average of this paper		3.77	7.18	16.28	21.75	9.12	5.43
Average of [14]		8.70	11.30	15.30	49.60	13.30	11.80
Average of [10]		17.80	8.36	15.60	29.70	7.70	12.50