Experimental Study on Strength, Acoustic Emission, and Energy Dissipation of Coal under Naturally and Forcedly Saturated Conditions

Table 4

The UCS test results of natural, naturally saturated, and forcedly saturated coal samples.

Type of coal sample	Sample ID	(MPa)		(10^−3)		(10^−3)		(GPa)
		Natural	A6	13.80	14.67	9.87	10.19	13.12	13.52	3.15	2.69
A7	16.29		10.90	15.75		2.47
A8	13.91		9.80	11.68		2.45
Naturally saturated	B6	8.42	8.88	7.42	7.58	9.69	10.50	1.44	1.70
	B7	10.19		8.68		11.84		1.90
	B8	8.03		6.63		9.98		1.77
Forcedly saturated	C6	1.54	2.44	13.72	11.86	19.96	19.16	0.13	0.29
	C7	2.42		11.52		21.49		0.33
	C8	3.36		10.34		16.02		0.42

Note.  = peak stress;  = strain at peak stress;  = maximum strain;  = elastic modulus;  = experiment value;  = average value.