Soil Constitutive Model Based On Structured

The classical soil constitutive models almost were constituted by reconstituted soil in the lab tests. Reconstituted soil is an artificial soil which is used to investigate the properties of soil in laboratory. But this type soil don't have soil structure, and the arrangement and bonding between the soil grains also has not been considered. So this kind of constitutive model can't reflect the infections of soil mechanics behavior which caused by soil structure. But in situ, most natural soils exhibit some form of structure, and these structures cause some complicated mechanics behaviors of the natural soil, such as arrangement and bonding of the constituents between soil grains. So constituting a structured soil constitutive model has very important practical significances for describing the mechanics behaviors of structured soil and dealing with the problems of practical engineering.This thesis based on classical modified Cam-Clay model, and a additional voids ratio has been introduced for research the relationship between voids ratio and stress of structured soil. And the relationship has been applied into the studying of structured soil's yielding surfaces. And the harding and losing of the soil structure have been discussed during compression and shearing stress paths of the soil body. After researching of the yielding function, suitable flow rule and harden law and elastic law of structured soil, a structured soil constituted model has been proposed.Adopting this new constituted model, the numerical integrating equations have been constituted under the drainage and un-drainage triaxial test stress paths. The curves between stress and strain have been simulated under triaxial test stress path, and a general discussion on soil structure property is presented.