Mechanical Properties and Damage Behavior of Rock-Coal-Rock Combined Samples under Coupled Static and Dynamic Loads

Table 2

Physical properties and initial wave velocity of RCRCS.

Coal height ratio (%)	Sample unit	Diameter (mm)	Length (mm)	Mass (g)	Wave velocity (m/s)
20	1a1-A1	49.83	100.80	438.6	1828.68
	1a1-A2	49.96	101.61	421.7	1896.31
	1a1-A3	49.25	100.68	432.8	1912.49
30	1a1-B1	49.51	100.04	398.7	1744.27
	1a1-B2	49.80	101.42	426.8	1738.04
	1a1-B3	49.68	100.47	413.1	1813.16
40	1a1-C1	49.51	100.70	422.7	1710.57
	1a1-C2	49.10	101.50	397.4	1695.36
	1a1-C3	50.04	101.37	438.6	1743.45
50	1a1-D1	49.09	101.38	421.7	1566.54
	1a1-D2	49.29	100.09	403.2	1468.28
	1a1-D3	50.15	100.78	429.3	1347.06