Calibrating the Micromechanical Parameters of the PFC2D(3D) Models Using the Improved Simulated Annealing Algorithm

Table 1

Microparameters of a contact-bonded material.

Parameter	Description
	Minimum ball radius [m]
	Ball size ratio, uniform distribution []
	Ball density [kg/m^3]
	Ball-ball contact modulus [Pa]
	Ball stiffness ratio []
	Ball friction coefficient
(mean)	Contact-bond normal strength, mean [Pa]
(std. dev.)	Contact-bond normal strength, std. dev. [Pa]
(mean)	Contact-bond shear strength, mean [Pa]
(std. dev.)	Contact-bond shear strength, std. dev. [Pa]