Strength and Failure Characteristics of Natural and Water-Saturated Coal Specimens under Static and Dynamic Loads

Table 1

Natural and saturated specimen parameters under uniaxial static compressive tests.

Specimen; number	Saturated; status	Diameter/; mm	Length/; mm	Density/gcm^−3		Strength/MPa		Failure strain/%		Elastic modulus/GPa
				Dry	Wet	Tested	Average	Tested	Average	Tested	Average
A1	Natural; Natural; Natural	4.97	2.86	1.41	/	43.11	42.71	28.57	25.64	2.62	2.65
A2		4.98	2.95	1.39	/	42.95		22.79		2.74
A3		3.98	3.02	1.41	/	42.07		25.57		2.59
A4	7D water; 7D water; 7D water	4.97	3.00	1.41	1.47	25.30	22.17	20.53	23.01	1.28	1.77
A5		4.98	3.05	1.38	1.46	20.81		32.71		2.11
A6		4.98	3.01	1.37	1.45	20.40		15.78		1.92