Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading

Table 1

Impact velocity under different impact pressures (m/s).

Impact pressure (MPa)	a	b	c	Average velocity (m/s)
0.25	9.660	9.800	9.615	9.7
0.28	10.716	10.757	10.430	10.6
0.31	11.410	11.463	11.545	11.4
0.34	12.243	12.255	12.168	12.2
0.37	12.927	12.930	12.824	12.8