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

Table 5

Parameters of E₁, E₂, and E₃ of stress-strain curve before peak strength, unload curve before 80–90% of peak strength, and curve after peak strength of the 27 coal specimens.

Specimens	E1	E2	E3	UCS (MPa)
No. 1	3.69	4.80	79.02	27.26
No. 2	3.50	4.24	73.12	25.13
No. 3	3.65	4.43	70.35	24.58
No. 4	3.58	6.67	55.33	22.70
No. 5	3.93	4.43	50.13	21.24
No. 6	3.57	4.32	35.16	21.08
No. 7	3.82	4.53	30.65	20.68
No. 8	3.15	3.66	35.93	20.39
No. 9	3.81	4.58	28.33	20.33
No. 10	3.08	3.73	27.63	20.24
No. 11	3.22	3.86	22.37	19.53
No. 12	3.27	3.74	21.66	18.65
No. 13	3.02	3.73	20.98	16.71
No. 14	2.86	3.73	14.99	16.65
No. 15	2.47	2.89	20.27	16.09
No. 16	2.90	3.43	18.17	15.82
No. 17	3.24	3.79	15.09	14.88
No. 18	2.56	3.51	14.20	12.40
No. 19	2.33	3.00	13.72	11.46
No. 20	1.87	2.34	10.52	11.03
No. 21	1.83	2.50	5.02	10.41
No. 22	1.78	2.46	3.37	9.08
No. 23	1.34	2.32	5.53	8.67
No. 24	2.02	2.98	1.56	6.87
No. 25	1.78	2.84	1.80	6.64
No. 26	1.77	2.62	2.49	6.07
No. 27	1.16	2.46	1.97	4.98