Mechanical Characteristics and Failure Characteristics of Jointed Rock under Axial Unloading and Radial Unloading

Table 2

Test results of cracked specimens under different axial unloading and radial unloading paths.

Unloading conditions	Cracked inclination angle (°)	Initial confining pressure (MPa)	Confining pressure unloading rate (MPa/s)	Axial pressure unloading rate (mm/min)	Strength (MPa)	Average of strength (MPa)	Error (MPa^2)
Axial unloading and radial unloading path	0	15	0.5	0.1	43.25	42.80	1.01
					44.07
					42.55
					41.33
	30	15	0.5	0.1	38.48	39.4	1.20
					40.02
					40.88
					38.22
	45	15	0.5	0.1	41.07	40.17	1.11
					41.29
					39.56
					38.76
	60	15	0.5	0.1	43.16	42.15	1.49
					42.31
					43.02
					40.11
	90	15	0.5	0.1	46.42	45.20	0.89
					44.28
					45.82
					44.28
	45	15	0.1	0.1	40.87	39.40	1.01
					39.64
					38.97
					38.12
	45	15	1.0	0.1	43.67	42.32	0.98
					42.85
					41.55
					41.21
	45	10	0.5	0.1	40.82	39.30	1.05
					39.56
					38.74
					38.08
	45	8	0.5	0.1	40.34	39.01	1.26
					39.76
					38.49
					37.45