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

Table 3

True triaxial compression strength of experimental and predicted results of rock mass models (data from [14]; here, compressive stress is considered positive).

σ3 (MPa)	σ2 (MPa)	σ1exp (MPa), test data at joint inclination angle β (°)						1cal (MPa), calculated data at joint inclination angle β (°)
		0	20	40	60	80	90	0	20	40	60	80	90
0.31	0.31	6.81	4.23	2.92	1.84	4.91	7.28	6.81	4.35	2.96	1.87	5.08	7.04
0.31	0.59	7.78	5.01	5.32	2.85	6.76	8.68	7.42	5.05	3.85	2.27	5.71	7.66
0.31	0.95	7.65	6.05	7.34	3.67	7.69	8.34	7.87	5.78	4.89	2.64	6.39	8.11
0.31	1.22	9.32	7.41	7.96	4.24	8.27	7.33	8.09	6.26	5.62	2.86	6.84	8.35
0.31	1.62	9.32	8.68	8.54	7.53	8.54	9.18	8.33	6.90	6.67	3.09	7.44	8.59
0.78	0.78	9.76	7.23	6.26	3.54	7.73	9.54	9.76	6.99	6.18	3.47	7.39	10.05
0.78	1.22	10.6	9.01	9.38	4.99	8.59	10.65	10.68	8.08	7.59	4.10	8.36	10.99
0.78	2.24	11.45	10.6	11.91	7.66	10.86	11.97	11.67	10.03	10.52	5.08	10.13	12.00
1.22	1.22	12.51	9.32	9.13	4.93	9.36	13.13	12.52	9.45	9.18	4.96	9.55	12.87
K	_	_	_	_	_	_		0.6109	0.7475	0.8433	0.8309	0.7666	0.6085
a	_	_	_	_	_	_		0.001191	0.001393	0.001269	0.001199	0.001474	0.002107
b	_	_	_	_	_	_		0.001073	0.001193	0.001185	0.000753	0.001179	0.001917
d	_	_	_	_	_	_		0.9252	0.5677	0.1452	0.3420	0.9118	0.9330