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

Table 2

Natural and saturated specimen parameters under uniaxial static-dynamic compressive tests.

Specimen; number	Saturated; status	Diameter/; mm	Length/mm	Density g/cm^−3		Static uniaxial pressure/MPa	Strain rate; /s^−1	Strength/MPa		Grain size/mm
				Dry	Wet			Tested	Average
B1	Natural	4.95	3.06	1.34	/	12	107	46.93	46.72	17.09
B2	Natural	4.98	3.09	1.33	/	12	131	46.50		16.42
B3	Natural	4.98	3.04	1.48	/	12	117	43.47		15.84
B4	Natural	4.96	3.11	1.30	/	12	111	49.96		16.11
B5	7D water	4.96	3.04	1.35	1.41	12	115	17.73	28.44	13.18
B6	7D water	4.96	2.98	1.41	1.48	12	128	40.63		12.08
B7	7D water	4.99	3.00	1.36	1.42	12	97	31.50		12.01
B8	7D water	4.95	3.14	1.34	1.39	12	128	23.88		13.54