Experimental Study on Crushing Characteristics of Lignite under Different Load Conditions

Table 2

Relevant parameters of point-load test and calculation results of strength index.

Numbered	W (mm)	D (mm)	P (kN)	Is (MPa)	F/1	Is50 (MPa)
1	85	60	1.49	0.25	1.22	0.30
2	96	54	1.86	0.31	1.22	0.38
3	104	90	2.06	0.18	1.41	0.25
4	82	75	1.88	0.26	1.27	0.33
5	83	71	1.56	0.22	1.26	0.28
6	117	95	2.09	0.16	1.46	0.23
7	96	55	2.04	0.33	1.23	0.40
8	98	50	1.38	0.24	1.21	0.29
9	102	82	3.51	0.36	1.36	0.49
10	65	55	0.44	0.10	1.13	0.11
11	74	52	0.92	0.20	1.14	0.23
12	140	55	1.77	0.20	1.33	0.26
13	81	62	0.94	0.16	1.22	0.19
14	83	65	1.49	0.23	1.24	0.28
15	104	55	1.28	0.19	1.25	0.24
16	109	57	1.42	0.19	1.28	0.24
17	132	65	2.64	0.27	1.36	0.37
18	75	60	1.56	0.29	1.19	0.35
19	109	52	1.62	0.24	1.25	0.30
20	109	65	2.85	0.36	1.30	0.46
21	113	56	1.84	0.24	1.28	0.31
22	108	66	2.49	0.30	1.31	0.39
23	67	50	1.29	0.32	1.11	0.36
24	83	55	1.67	0.34	1.16	0.40
25	73	55	1.52	0.32	1.15	0.37
26	75	70	2.2	0.37	1.22	0.45
27	68	55	1.57	0.36	1.13	0.41

Average value I_s50 = 0.32 MPa after removing the minimum and maximum data.