Experimental and Simulation Study on Breaking Rock under Coupled Static Loading and Ultrasonic Vibration

Table 1

Microproperties of balls and contacts [31].

	Properties	Value
Ball properties	Ball density (kg/m^3)	2650
	Ball radius (mm)	0.28 ± 0.04
Ball-ball contact properties	Bonded element fraction,	0.9
	Slit element fraction,	0.1
	Stiffness ratio	1.8
	Effective moduli (GPa)	40
	Mean and standard deviation bond tensile strength, (Mpa)	11.6 ± 0.39
	Mean and standard deviation bond cohesion, Cb (Mpa)	61.5 ± 1.53
	Local friction angle, (°)	4
	Residual friction angle, (°)	10
Ball-wall contact properties	Normal stiffness (MN/m)	100
	Tangential stiffness (MN/m)	0