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

Table 1

Energy of coal specimens under dynamic impact.

Type	Specimen no.	Strain rate (s^−1)	Incident energy (J)	Reflected energy (J)	Transmitted energy (J)	Crushing energy (J)	Crushing energy density (J·m^−3)	Energy dissipation rate
Outburst coal	D1	73	32.98	27.04	0.17	5.78	81563	0.175
	D2	78	57.21	48.58	0.12	8.51	128991	0.149
	D3	81	63.19	56.64	0.10	6.46	90996	0.102
	D4	101	166.70	130.64	0.15	35.91	156918	0.215
	D5	115	226.65	183.42	0.65	42.59	188245	0.188
	D6	129	268.20	218.20	0.52	49.48	219607	0.184
	D7	160	424.55	344.91	0.50	79.14	345802	0.186
	D8	174	254.14	222.23	0.15	31.76	475742	0.206
	D9	193	609.29	494.99	0.79	113.51	499874	0.186
	D10	214	349.36	279.52	0.26	69.58	795067	0.149
	D11	219	391.21	328.17	0.29	62.75	951140	0.160
	D12	221	663.94	520.78	0.94	142.22	853109	0.173
	D13	268	497.17	400.90	0.67	95.61	1585950	0.192
	D14	279	518.02	430.40	0.55	87.07	1628234	0.187
Nonoutburst coal	D15	96	85.70	75.15	0.82	9.72	159767	0.113
	D16	120	111.73	87.44	0.77	23.52	315228	0.211
	D17	125	117.27	90.56	0.80	25.91	435503	0.221
	D18	145	152.78	113.10	0.51	39.17	651923	0.256
	D19	177	242.73	184.94	0.70	57.09	944028	0.235
	D20	186	304.03	232.57	1.23	70.23	1391585	0.231