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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。
The stress of a certain soil particle in the interface of soil-structure interaction depends not only on the strain and deformation history of this point, but also on the stress of many points adjacent to this point. Combining with the earlier non-local theory, that is, considering the interaction between micro-structures of heterogeneous materials and their effects, the non-local plastic shear strain is expressed as a weighted average of its own corresponding parameters. Considering the influence of structural surface roughness on the interfacial layer Soil mechanical properties, the constitutive model of soil-structure interface under relatively low stress is established based on strain gradient plasticity theory. The physical meaning of each parameter in the model is clear. The results show that this model can be used to study the relationship between shear stress and shear strain at the interface between soil and structure, especially the relationship between softening stage and peak shear stress.