Characterization of Elastic Modulus of Granular Materials in a New Designed Uniaxial Oedometric System**Supported by the National Natural Science Foundation of China under Grant Nos 11372038 and 11402023.

Abstract

A simple uniaxial oedometric system is developed to test the elastic modulus of granular materials. The stress–strain relationship is first measured under conditions of uniaxial compression with additional lateral stress and strain, then the elastic modulus of the material is determined by the linear fitting method. It is found that the modulus is positively correlated to the grain size and negatively correlated to the container size. Arching and dragging are revealed to be the mechanism of such correlations by using the digital image correlation method and the pressure film technology based on the statistical method.