中文摘要：

土-结构相互作用界面层内某点土颗粒的应力,不仅取决于该点的应变及变形历史,而且还取决于与该点邻近的诸多点的应力。结合早期的非局部理论,即考虑非均质材料微小结构之间的相互影响和作用,将非局部塑性剪切应变表达为其本身所对应参数的加权平均,考虑结构面粗糙度对界面层内土体力学特性的影响,建立了相对低应力条件下基于应变梯度塑性理论的土-结构接触面本构模型,模型中各参量物理意义明确。结果表明:利用该模型可以研究土与结构相互作用时接触面上的剪切应力与剪切应变间的关系,尤其是峰值剪应力后即软化阶段二者之间的相互关系。

英文摘要：

The stress of a soil particle at a point in the soil-structure interface layer not only depends on the strain and deformation history of the point, but also depends on the stresses of other points near the point.According to the early non-local theory, considering the influence and interaction between the tiny structures of the non-homogeneous materials, the non-local plastic shear strain was expressed as the weighted average of the corresponding parameters of itself, and also considering the effect of rough ness of structural surface on the mechanical characteristics of the soil in the interface layer, the constitutive model of soil-structure interface based on strain gradient plasticity theory was established under relatively low normal stress condition.Each parameter in the model had a clear physical meaning. The results showed that the model could be used to study the relationship between shear stress and shear strain, especially in the case that the characteristics of strain softening after the peak shear stress.