A Three Dimensional Discrete Constitutive Model for Over Coarse Grained Soil

Abstract

Over Coarse Grained Soil is widely used as filling material for subgrade in mountainous highway, and the settlement and stabilization of high embankment settlement is critical to operation safety of mountainous highway. The constitutive relationship of over coarse grained soil is theoretical basis for settlement and stability analysis. So a rigid contact model for over coarse grained soil particles is established combined with the distribution of contact force and normal of contact force based on the research of contact characteristics of particles and ignoring the deformation of particle. The local constitutive model is acquired after analyzing the relationship between contact force of particles and local stress in over coarse grained soil. Furthermore, a three dimensional discrete constitutive model is built up. It is proved through discrete constitutive model that the fabric will change during the deformation of over coarse grained soil which results the change of physical and mechanical characteristics. The change of fabric affects the macro mechanical responses characteristics of over coarse grained soil.