Abstract
Settlement and deformation problems in the Western Sichuan area often occur in embankments consisting of mixed soil. Soil-accumulated deformation under traffic loads could be described by establishing a dynamic constitutive model under cyclic loading. This study elaborates on an unsaturated dynamic constitutive model (MUD model) for mixed soil within the framework of the elastic–plastic bounding surface model combined with a real description of the unsaturated soil collapsible performance loading-collapse yield curve based on the mapping rule of a mobile mapping origin. This study also considers the two main influencing factors of unsaturated state and fine particle content and takes the classic modified Cambridge model as a plastic potential equation. The comparisons between the experimental results and the model simulations show that the elaborated model is capable of describing the unsaturated deformation behaviours under static and cyclic loading and predicting the phenomenon of hysteretic properties.
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