Study of Post-Peak Strain Softening Mechanical Behaviour of Rock Material Based on Hoek–Brown Criterion

Table 3

Rock strength parameters of different rock types at the peak position and at the starting point of the residual stage.

Rock type	Confining pressure (MPa)	(10^−3)			(10^−3)
Indiana limestone	2	3.4	7.67	0.47	5.5	1.17	0.03	16.94
	4	4.2	3.81	0.71	6.3	1.25	0.05	16.60
	8	5.0	2.86	0.86	8.1	2.15	0.19	4.79
	12	5.9	2.70	0.98	8.0	2.25	0.40	2.52
Tennessee marble	3	2.4	4.1	0.84	3.2	2.54	0.12	7.00
	7	2.8	4.0	0.85	3.8	2.50	0.15	5.67
	14	3.2	3.9	0.92	4.9	2.42	0.22	4.18
	21	3.5	3.2	1.00	6.0	1.80	0.31	3.23
Hegang granite	2	4.2	18.83	0.37	5.6	2.36	0.02	24.18
	5	5.5	14.44	0.44	8.8	2.45	0.02	19.82
	10	6.7	13.50	0.64	12.6	2.53	0.09	7.29
	15	7.5	11.99	0.98	20.0	2.95	0.15	6.63