Study on Stress Evolution and Crushing Behavior of Jointed Rock Mass under Confining Pressure and Joint Materials

Table 4

Dynamic characteristic of jointed rock mass under confining pressure.

Impact pressure (MPa)	Active confining pressure (MPa)	Bullet velocity (m/s)	Peak stress (MPa)	Transmission coefficient	Reflection coefficient
0.2	3	8.65	84.88	0.51	0.77
	6	9.34	105.99	0.66	0.63
	9	9.06	115.76	0.72	0.61
0.5	3	16.95	184.57	0.54	0.92
	6	17.37	199.26	0.57	0.83
	9	17.53	209.90	0.63	0.79