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

Table 3

Size distribution characteristics of the coal blocks under different impact pressures.

Fragment scale	Percentage of mass of coal fragments miv under each pressure (MPa)
	0.13	0.17	0.25	0.30	0.50	0.70	0.90	1.20	1.50	2.00
Large	98.93	74.98	49.99	37.14	32.52	30.25	10.27	9.07	10.30	4.65
Medium	0.95	23.74	44.73	56.98	60.29	63.15	82.31	73.72	69.47	62.57
Powder	0.12	1.28	5.28	5.88	7.19	6.60	9.42	17.21	20.23	32.78