Simulation of the Uniaxial Mechanical Properties and Crack Evolution of Coal Pillar-Artificial Dam in Abandoned Mines

Table 2

Micromechanical parameters of the numerical model.

Type	Name	Value
Coal pillar	Particle radius	1.0∼1.5 mm
	Friction coefficient	0.4
	Effective modulus	0.4 GPa
	Normal stiffness	1.7 MPa
	Tangential stiffness	3.4 MPa
Interface	Particle radius	1.0∼1.5 mm
	Friction coefficient	0.4
	Effective modulus	2 GPa
	Normal stiffness	6 MPa
	Tangential stiffness	12 MPa
Artificial dam	Particle radius	1.0∼1.5 mm
	Friction coefficient	0.4
	Effective modulus	2 GPa
	Normal stiffness	10 MPa
	Tangential stiffness	20 MPa