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

Table 3

Dynamic characteristics of jointed rock mass under the influence of joint material.

Specimen number	Bullet velocity (m/s)	Peak stress (MPa)	Average value (MPa)	Transmission coefficient	Reflection coefficient	Transmission average value	Reflection average value
Gypsum	8.63	57.92	52.50	0.44	0.72	0.40	0.78
	8.67	53.01		0.43	0.66
	9.20	46.58		0.35	0.85
Cement mortar	9.42	62.77	59.83	0.46	0.76	0.44	0.77
	9.50	40.83		0.35	0.83
	9.93	75.90		0.51	0.71
Epoxy resin	8.71	18.67	22.71	0.15	0.96	0.16	0.93
	8.66	26.89		0.18	0.90
	8.85	22.56		0.16	0.92