Abstract The gravelly soil-structure interface was observed to exhibit a significant coupling effect among the orthogonal shear directions due to the three-dimensional shear application in different experimental investigations, which governs major three-dimensional features of the interface. In this paper, initially, a three-dimensional modeling framework is established based on the analyses of interface behavior under different shear coupling conditions. A series of concepts and assumptions are derived in this framework, banking on which a three-dimensional model scheme is proposed by reasonably modeling the shear coupling effect. Afterward, a three-dimensional elasto-plastic damage interface model is developed based on the proposed model scheme and modified formulations of a previous two-dimensional EPDI model. Only a single new parameter is introduced in the three-dimensional shear stress-strain relationship modeling scheme to quantify the three-dimensional shear response of the interface besides already known parameters of the EPDI model. The model can simulate the monotonic and cyclic response of interface along two and three-dimensional shear paths in a unified manner. The performance of the model is validated based on test data from the literature. The model can capture different essential features of the gravelly soil-structure interface behavior under three-dimensional conditions, e.g., coupling effect, volumetric change behavior and aeolotropy.

中文翻译：

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考虑剪切耦合效应的砾石土-结构界面三维弹塑性损伤模型

摘要 由于在不同的实验研究中应用了三维剪切，砾石-结构界面在正交剪切方向之间表现出显着的耦合效应，这决定了界面的主要三维特征。在本文中，基于不同剪切耦合条件下界面行为的分析，初步建立了三维建模框架。在该框架下推导出一系列概念和假设，并在此基础上通过对剪切耦合效应的合理建模，提出三维模型方案。然后，基于提出的模型方案和先前二维 EPDI 模型的修改公式，开发了三维弹塑性损伤界面模型。除了EPDI模型的已知参数外，三维剪切应力-应变关系建模方案仅引入了一个新参数来量化界面的三维剪切响应。该模型可以统一模拟界面沿二维和三维剪切路径的单调循环响应。该模型的性能基于文献中的测试数据进行验证。该模型可以捕捉三维条件下砾石土-结构界面行为的不同基本特征，例如耦合效应、体积变化行为和非向性。该模型可以统一模拟界面沿二维和三维剪切路径的单调循环响应。该模型的性能基于文献中的测试数据进行验证。该模型可以捕捉三维条件下砾石土-结构界面行为的不同基本特征，例如耦合效应、体积变化行为和非向性。该模型可以统一模拟界面沿二维和三维剪切路径的单调循环响应。该模型的性能基于文献中的测试数据进行验证。该模型可以捕捉三维条件下砾石土-结构界面行为的不同基本特征，例如耦合效应、体积变化行为和非向性。