A Parabolic Failure Criterion for Transversely Isotropic Rock: Modification and Verification

Table 1

Fitting results of and relative values.

Dry phyllite	β	0°	15°	30°	45°	60°	75°	90°
		1.078	0.956	0.982	0.923	0.917	1.005	1.104
		0.973	0.961	0.961	0.948	0.951	0.967	0.977
Dry orthoquartzite	β	0°	15°	30°	45°	60°	75°	90°
		1.638	1.63	1.472	1.511	1.588	1.62	1.558
		0.984	0.989	0.991	0.981	0.996	0.984	0.987
Dry slate	β	0°	15°	30°	45°	60°	75°	90°
		1.253	1.133	1.079	1.076	1.15	1.154	1.21
		0.987	0.988	0.987	0.992	0.989	0.986	0.988
Chlorite	β	0°	15°	30°	45°	60°	75°	90°
		1.177	1.254	1.218	1.079	1.012	1.089	1.162
		0.967	0.948	0.975	0.986	0.985	0.986	0.995
Biotite schist	β	0°	30°	45°	60°	75°	90°
		1.161	1.158	1.186	1.148	1.144	1.195
		0.985	0.987	0.979	0.974	0.946	0.954