Numerical Investigation of Relationship between Bursting Proneness and Mechanical Parameters of Coal

Table 4

The mechanical parameters determined by numerically fitting the stress-strain curve in the uniaxial compressive test.

Specimens	Young’s modulus (GPa)	Poisson’s ratio	UCS (MPa)	Cohesion			Friction angle			Tensile strength
				Original value (MPa)	Softening rate (%)	Residual value (MPa)	Original value (°)	Softening rate (%)	Residual value (°)	Original value (MPa)	Softening rate (%)	Residual value (MPa)
No. 1	3.69	0.22	27.26	6.82	0.20	1.00	37	0.20	35	2.87	0.20	0
No. 2	3.50	0.22	25.13	6.20	5.20	0.30	37	5.20	35	2.89	5.20	0
No. 3	3.65	0.22	24.58	6.07	2.80	0.50	37	2.80	35	2.43	2.80	0
No. 4	3.58	0.22	22.70	5.58	1.80	1.50	37	1.80	35	2.43	1.80	0
No. 5	3.93	0.22	21.24	5.25	4.15	0.30	37	4.15	33	2.16	4.15	0
No. 6	3.57	0.22	21.08	4.73	2.10	0.51	41	2.10	39	2.18	2.10	0
No. 7	3.82	0.23	20.68	5.10	7.00	0.50	37	7.00	35	2.21	7.00	0
No. 8	3.15	0.22	20.39	5.05	4.70	0.50	37	4.70	35	2.20	4.70	0
No. 9	3.81	0.22	20.33	5.02	2.15	0.50	37	2.15	35	2.10	2.15	0
No. 10	3.08	0.22	20.24	4.98	4.05	1.50	37	4.05	35	2.03	4.05	0
No. 11	3.22	0.22	19.53	4.81	1.20	0.50	38	1.20	35	2.07	1.20	0
No. 12	3.27	0.25	18.65	4.82	5.00	0.30	35	5.00	31	1.91	5.00	0
No. 13	3.02	0.22	16.71	4.02	3.50	0.50	37	3.50	35	1.78	3.50	0
No. 14	2.86	0.22	16.65	4.10	4.20	0.10	37	4.20	35	2.02	4.20	0
No. 15	2.47	0.22	16.09	3.97	4.32	0.50	37	4.32	35	1.77	4.32	0
No. 16	2.90	0.22	15.82	3.89	5.80	0.28	37	5.80	35	1.53	5.80	0
No. 17	3.24	0.25	14.88	3.85	2.40	0.30	35	2.40	31	1.54	2.40	0
No. 18	2.56	0.23	12.40	3.03	3.50	0.50	35	3.50	32	1.24	3.50	0
No. 19	2.33	0.28	11.46	3.63	5.70	0.10	25	5.70	22	1.18	5.70	0
No. 20	1.87	0.24	11.03	3.10	5.00	0.60	31	5.00	27	1.14	5.00	0
No. 21	1.83	0.24	10.41	2.79	7.50	0.15	33	7.50	29	1.01	7.50	0
No. 22	1.78	0.27	9.08	2.20	1.90	0.80	35	1.90	31	0.93	1.90	0
No. 23	1.34	0.25	8.67	2.39	4.50	0.30	32	4.50	28	0.89	4.50	0
No. 24	2.02	0.22	6.87	1.66	2.50	0.20	37	2.50	35	0.75	2.50	0
No. 25	1.78	0.22	6.64	1.47	3.20	0.01	41	3.20	39	0.70	3.20	0
No. 26	1.77	0.22	6.07	1.46	4.00	0.01	37	4.00	35	0.67	4.00	0
No. 27	1.16	0.22	4.98	1.19	3.55	0.10	37	3.55	35	0.55	3.55	0