Experimental Study on Mechanical Properties and Energy Dissipation of Gas Coal under Dynamic and Static Loads

Table 2

Dynamic impact test results of gas coal (seam no. 13-1) in Pansan Coal Mine.

Sample number	Impact gas pressure (MPa)	Velocity of impact bar (m·s^−1)		Average strain rate (s^−1)		Maximum strain rate (s^−1)	Peak stress (MPa)		Peak strain (%)	Mixed dynamic elasticity modulus (GPa)	Failure mode
		Single sample	Arithmetic mean value	Single sample	Arithmetic mean value		Single sample	Arithmetic mean value
1-1	0.2	5.879	5.534	64.013	58.840	78.754	19.274	20.946	5.753	3.350	Splitting
1-2		5.985		53.464		60.545	22.413		4.576	4.898	Splitting
1-3		5.429		58.377		76.872	19.026		5.648	3.369	Crushing
1-4		5.277		58.233		68.781	21.894		4.446	4.925	Splitting
1-5		5.098		60.111		70.803	22.121		3.766	5.874	Crushing
2-1	0.5	12.120	12.157	100.650	101.416	108.423	33.942	34.061	4.880	6.955	Crushing
2-2		12.147		101.647		106.031	31.742		4.800	6.613	Crushing
2-4		12.155		97.402		101.256	35.912		5.726	6.272	Crushing
2-5		12.204		105.965		115.406	34.648		5.793	5.981	Crushing
3-2	0.8	16.130	16.327	148.499	144.290	172.063	45.770	45.770	6.023	7.599	Crushing
3-3		16.548		148.035		149.481	43.515		6.195	7.024	Crushing
3-4		16.279		140.113		146.292	44.611		5.016	8.894	Crushing
3-5		16.351		140.512		148.883	40.246		4.910	8.197	Crushing
4-2	1.1	19.821	19.603	200.447	201.212	217.325	48.102	49.763	4.982	9.655	Grinding
4-3		19.807		200.909		218.712	50.147		5.265	9.525	Crushing
4-4		19.773		208.076		249.849	52.376		5.836	8.975	Grinding
4-5		19.011		195.416		226.518	48.425		5.152	9.399	Crushing