Mechanical Behaviors and AE Characteristics of Brittle Coal Specimens with Different Fissure Angles

Table 1

Mechanical parameters of the specimens under uniaxial compression tests.

Number	UCS/MPa	Average/MPa	Standard deviation	E/GPa	Average/GPa	Standard deviation	Peak strain/%	Average/%	Standard deviation
a-1	31.62	32.8	1.1800	1.76	1.74	0.0200	2.30	2.39	0.0882
a-2	33.98			1.72			2.47
0°-1	10.16	9.55	0.4570	0.7	0.83	0.0990	2.46	1.77	0.5000
0°-2	9.43			0.85			1.56
0°-3	9.06			0.94			1.30
15°-1	6.38	6.47	0.0900	1.07	1.06	0.0050	0.79	0.79	0.0042
15°-2	6.56			1.06			0.78
30°-1	12.14	12.60	0.4374	1.10	1.25	0.1040	1.68	1.53	0.1209
30°-2	13.19			1.31			1.52
30°-3	12.48			1.33			1.38
45°-1	9.03	8.14	0.6405	1.20	1.19	0.0094	0.98	0.87	0.0780
45°-2	7.56			1.18			0.84
45°-3	7.82			1.20			0.79
60°-1	18.61	16.4	1.6112	1.53	1.46	0.0741	1.82	1.65	0.1199
60°-2	15.79			1.5			1.55
60°-3	14.81			1.36			1.58