Progressive Damage Process and Failure Characteristics of Coal under Uniaxial Compression with Different Loading Rates

Table 1

Physical and mechanical parameters of samples at different loading rates.

Loading rate (mm/min)	P-wave velocity (km/s)	Peak strength (MPa)	Average peak strength (MPa)	Elastic modulus (GPa)	Average elastic modulus (GPa)
0.002	1.57	19.57	21.88	2.03	2.11
	1.21	24.19		2.19
0.004	1.79	17.93	21.94	3.47	2.83
	1.25	25.94		2.20
0.006	1.44	23.82	22.34	2.25	2.16
	1.23	20.85		2.07
0.008	1.31	25.99	24.23	2.92	2.53
	1.32	22.46		2.13
0.010	0.99	20.84	27.18	2.42	2.08
	1.31	33.52		1.74