Research on Energy Dissipation Laws of Coal Crushing under the Impact Loads

Table 4

The screening statistics and fractal computing results of fragments of outburst and nonoutburst coal.

Type	Specimen no.	Strain rate (s^−1)	The cumulative mass under the sieve/g					Total mass of fragments (g)	Specimen mass (g)	b	Fractal dimension D
			<0.5 mm	<1 mm	<10 mm	<20 mm	<30 mm
Outburst coal	D1	73	0.2	0.5	2.2	3.5	3.5	77.8	78.6	0.63	2.37
	D2	78	0.8	0.9	5.3	6.7	6.7	79.0	79.2	0.59	2.41
	D3	81	0.8	1.1	3.8	6.9	8.5	85.3	85.5	0.58	2.42
	D4	102	11	14.7	47.5	67.5	78.3	78.3	79.9	0.49	2.51
	D5	115	12.2	16.6	49.6	66.8	76.4	76.4	78.8	0.42	2.58
	D6	129	13.2	18.2	52.6	68.5	77.2	77.2	79.7	0.70	2.30
	D7	160	14.5	19.3	57.4	69.3	75.9	75.9	78.2	0.44	2.56
	D8	174	15.6	20.6	59.7	72.2	75.3	75.3	79.8	0.40	2.60
	D9	193	17.1	22.1	60.3	70.5	74.8	74.8	76.9	0.46	2.54
	D10	214	19.4	25.1	65.5	69.9	69.9	69.9	77.5	0.34	2.66
	D11	219	17.4	22.6	58.9	71.6	71.6	71.6	79.3	0.37	2.63
	D12	221	17.5	23.4	63.5	68.3	68.3	68.3	73.6	0.52	2.48
	D13	268	17.3	22.3	62.9	66.5	66.5	66.5	74.6	0.36	2.64
	D14	279	16.6	21.3	58.3	64.2	64.2	64.2	72.7	0.36	2.64
Nonoutburst coal	D15	96	0.1	1.3	38.5	87.1	87.1	87.1	89.2	1.61	1.39
	D16	120	0.3	2.0	39.2	75.4	76.8	76.8	79.4	1.46	1.54
	D17	125	0.4	2.5	50.5	71.5	75.6	75.6	83.0	1.27	1.73
	D18	145	2.5	5.7	48	80	90.1	90.1	86.9	0.89	2.11
	D19	177	2.2	6.3	54.6	75	77	77	82.5	0.80	2.20
	D20	186	1.4	5	59.4	76	76	76	83.7	0.69	2.31