Study On Constitutive Model For Soil-structure Interface Based On Strain Localization Theory

Soil-structure interaction problem widely exist in civil engineering field. The behavior of the soil in Soil-structure interaction is different from the soil outside it. The soil and structure interact by the interface. The study of Soil-structure interaction have done for decades and get some result, but it still needs more study.After collecting and reading lots of literature, the constitutive models and phenomena of shear experiments of Soil-structure interface was analyzed. And some new point of view and constitutive model was brought forward. Details including:(1) Considering the mechanics property of the micro cells of interface under shearing change, a new statistical damage constitutive model for soil-structure interface was proposed based on the constitutive model in existence.(2) In aspect of shear experiment of Soil-structure interface, under the guidance of strain localization theory, the phenomena of shear experiments of Soil-structure interface was analyzed and summarized, then compared with the strain localization phenomena of soil. The conclusion of cohesive Soil-structure interface is different from the granular soil's. The shear band of granular Soil-structure interface is strain localization band, but the shear band of cohesive Soil-structure interface is not. Although, the shear band generate because of the strain localization band.(3) A new strain gradient plasticity increment constitutive model for soil-structure interface was advanced, basing on strain gradient plasticity theory. The constitutive model proved the conclusion above. it provide another way of study of soil-structure interface.