Experimental Study on the Effect of Gas Pressure on Ultrasonic Velocity and Anisotropy of Anthracite

Table 1

Basic parameters of coal samples.

Sample ID	Size () (mm^3)	(g/mm^3)
#8-A		1.62	2.00	10.32	10.29	33.73	1.42
#8-B		1.60	1.98	10.37	10.25	33.69	1.41
#8-C		1.61	1.99	10.37	10.18	33.71	1.42
#8-D		1.63	2.01	10.25	10.35	33.77	1.45
#8-E		1.59	1.98	10.41	10.20	33.67	1.40