Meso-structure parameters of discrete element method of sand pebble surrounding rock particles in different dense degrees

Abstract

Through large-scale triaxial test of coarse-grained soils, we obtained stress-strain curve of sand pebble soil in different dense degrees and concluded that the peak stress of sand pebble soil increase with the sample dense degree. On this basis, we established triaxial test 3D simulation model of sand pebble soil using particle discrete element software, and obtained values of meso-structure parameters of sand pebble soil through comparing with results of large triaxial test, finding that particle contact modulus, friction coefficient and porosity are three main meso-structure parameters that affect the strength of sand pebble soil, while rigidity ratio and particle density are nearly of no effect to the strength to sand pebble soil.