Research Article

Particle Flow Simulation of Failure Characteristics of Deep Rock Influenced by Sample Height-to-Width Ratios and Initial Stress Level under True-Triaxial Unloading

Table 1

Microparameters of the calibrated PFC3D model.

MicroparameterDescriptionCalibrated value

(mm)Minimum particle radius1.5
Particle radius ratio1.66
(GPa)Effective modulus15
Normal-to-shear stiffness ratio1.5
Particle friction coefficient0.5
(MPa)Bond effective modulus15
Bond normal-to-shear stiffness ratio1.5
(MPa)Normal bond strength ()
(MPa)Shear bond strength ()
Bond width multiplier1