Acoustic Emission Response Characteristics of Anthracitic Coal under Uniaxial Compression

Table 1

Preliminary parameters of coal samples.

Number	Height (z-mm)	Length (x-mm)	Width (y-mm)	Mass (g)	Volume (cm^3)	Density (g/cm^3)	Wave velocity (km/s)			Mean	Variance
							z	x	y
0	100.20	50.40	50.40	380.60	254.52	1.50	1.74	1.91	1.74	1.80	0.0096
1	100.00	50.00	50.00	441.80	250.00	1.77	2.54	3.25	2.68	2.82	0.1443
2	100.00	50.00	50.00	379.30	250.00	1.52	1.48	1.69	1.71	1.63	0.0166
3	100.00	50.00	50.00	444.70	250.00	1.78	2.54	2.81	2.65	2.67	0.0188
4	98.24	50.00	50.00	361.50	245.60	1.47	1.79	1.89	1.89	1.86	0.0034
5	98.30	50.02	50.06	354.40	246.14	1.44	1.97	1.73	1.80	1.83	0.0152
6	98.44	50.02	50.06	345.90	246.49	1.40	2.22	1.94	2.18	2.11	0.0229
7	72.40	45.90	45.90	228.20	152.53	1.50	1.60	1.63	1.78	1.67	0.0096
Mean						1.55	1.98	2.11	2.05	2.05	0.0039
Variance						0.02	0.17	0.35	0.16	0.23	0.0118