Investigation of the Anisotropic Characteristics of Layered Rocks under Uniaxial Compression Based on the 3D Printing Technology and the Combined Finite-Discrete Element Method

Table 1

FDEM input parameters.

Input parameters	Value
Continuum triangular element
Young’s modulus, Emax (GPa)	2.286
Young’s modulus, Emin (GPa)	1.204
Bulk density, ρ (kg/m³)	1260
Poisson’s ratio, υmax	0.3
Poisson’s ratio, υmin	0.2
Viscous damping coefficient [36], μ (kg/(m·s))	339.43
Shear modulus, G′ (GPa)	0.879
Joint element
Tensile strength, ft,max (MPa)	0.25
Tensile strength, ft,min (MPa)	0.07
Cohesion, cmax (MPa)	7.5
Cohesion, cmin (MPa)	3
Mode I fracture energy, GI,max (J/m^2)	4.6
Mode I fracture energy, GI,min (J/m^2)	2.5
Mode II fracture energy, GII,max (J/m^2)	62
Mode II fracture energy, GII,min (J/m^2)	17.5
Friction angle of intact material, φi (°)	26
Friction angle of fracture, φr (°)	26
Normal contact penalty, pn (GPa)	22.86
Tangential contact penalty, pt (GPa)	2.286
Fracture penalty, pf (GPa)	11.43
Platen-specimen friction coefficient, k (—)	0.1