The impact of porosity and crack density on the elasticity, strength and friction of cohesive granular materials: Insights from DEM modelling

摘要: This study uses the Discrete Element Method (DEM), in which rock is represented by bonded, spherical particles, to investigate dependence of elasticity, strength and friction angle on porosity crack density. A series confined triaxial extension compression tests were performed samples that generated with different particle packing methods, characterised differing size distributions porosities, proportions pre-existing cracks, or uncemented contacts, modelled as non-bonded contacts. The 3D DEM model results demonstrate decreases (almost) linearly increasing porosity, independent distribution. Young's modulus, ratio unconfined compressive tensile (UCS/T) also decrease whereas Poisson's independent. pre-eminent control UCS/T is, however, proportion bonded suggesting increases modulus decrease, while modelling replicate a wide range empirical relationships observed rocks underpin improved methods for calibration materials.