Acoustic Emission Response Characteristics of Anthracitic Coal under Uniaxial Compression

Table 3

Mechanical parameters obtained from the experiment.

Number	Compressive strength (MPa)	Linear elastic modulus (GPa)	Poisson’s ratio	Internal friction angle (°)	Bulk modulus (GPa)	Shear modulus (GPa)	Cohesion (MPa)
0	9.31	1.79	0.34	18.65	1.86	0.67	3.42
2	6.32	1.29	0.31	21.80	1.16	0.49	2.27
4	7.70	1.30	0.33	20.12	1.26	0.49	2.61
5	13.92	2.00	0.30	23.66	1.66	0.77	4.86
6	10.06	1.69	0.35	17.39	1.88	0.63	3.29
Average	9.46	1.61	0.33	20.32	1.57	0.61	3.29

Note. Since Poisson’s ratio of raw coal samples is greater than or equal to 0.3, the calculation of friction angle is based on formula (4).