Numerical Investigation of the Elastic Properties of Binary Mixtures as a Function of the Size Ratio and Fines Content

Abstract

This paper examines the influences of the size ratio and fines content on Young's modulus and the shear modulus of binary mixtures using the discrete element method. The moduli were gained by numerical simulations of drained triaxial compression tests. The contribution of each contact type is quantified, and the results indicate that the moduli are controlled by the combined action of various contact types. The analysis of microscopic characteristics shows that the moduli rely on the modified void ratio and 2/3 power of the modified volume-weighted coordination number. Additionally, a good relationship among the normalized modulus, the volume-weighted coordination number, and the peak friction angle is found.