Blasting Impact Simulation Test and Fragmentation Distribution Characteristics in an Open-Pit Mine

Table 1

Distribution characteristics of the fragmentation of coal specimens at different pressures.

P/MPa	m (g)	m iv (%)						Δ (mm)
		i = 1	i = 2	i = 3	i = 4	i = 5	i = 6
0.13	119.70	98.93	0.00	0.68	0.27	0.07	0.05	32.21
0.17	118.80	74.98	15.52	6.12	2.1	0.81	0.47	27.63
0.25	122.30	49.99	24.09	14.51	6.13	3.69	1.59	21.83
0.30	118.20	37.14	34.98	15.16	6.84	4.22	1.66	19.64
0.50	120.80	32.52	30.12	21.15	9.02	4.98	2.21	17.83
0.70	121.80	30.25	25.26	26.02	11.87	4.79	1.81	16.70
0.90	121.80	10.27	35.43	31.23	15.65	6.47	2.95	12.54
1.20	120.10	9.07	23.33	30.07	20.32	14.14	3.07	10.22
1.50	127.50	10.3	15.99	32.11	21.37	15.71	4.52	9.56
2.00	132.30	4.65	14.68	29.63	18.26	23.33	9.45	7.34