Analysis of the Damage Characteristics and Energy Dissipation of Rocks with a Vertical Hole under Cyclic Impact Loads

Table 2

Experimental results for some granite specimens under cyclical impact loads.

Specimen number	Impact air pressure (MPa)	Number of impacts	Wave impedance (MPa/s)	Incident energy (J)	Absorption energy per unit volume (J/cm^3)	Average strain rate (s^−1)	Dynamic peak stress (MPa)
D-0.6-2	0.6	1	127.83	78.83	0.123	24.82	113.89
		2	108.55	80.05	0.152	30.86	85.39
		3	103.68	81.86	0.156	31.14	83.09
		4	99.36	81.88	0.156	30.23	88.63
		5	93.57	75.76	0.165	32.41	82.68
		6	72.72	77.87	0.206	38.02	59.37
D-0.7-3	0.7	1	125.04	123.47	0.186	30.84	131.63
		2	111.38	126.64	0.194	31.73	129.46
		3	95.88	123.04	0.263	39.37	95.58
		4	63.03	126.11	0.291	42.09	76.46
D-0.8-3	0.8	1	117.34	163.35	0.255	36.76	150.38
		2	88.36	162.27	0.311	41.75	137.02
		3	41.09	157.22	0.415	51.67	98.94
B-0.6-1	0.6–0.7	1	123.41	83.23	0.165	27.15	74.90
		2	34.77	127.49	0.276	35.51	118.77
B-0.7-3	0.7–0.8	1	118.23	113.31	0.157	28.61	101.65
		2	26.87	152.21	0.330	39.83	129.68