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首先探讨了土结接触面的含义、接触面相对位移的组成以及接触面的破坏形式,然后提出以黏聚区域模型描述接触面滑动和拉裂破坏变形、邻近非接触面单元描述接触面基本变形的分析思路,建立了基于黏聚区域模型的无厚度接触面单元,有效避免了接触面厚度确定的困难。在强化有限单元法(FEM++)的框架内完成了接触面模型的数值实现后,以直剪试验的模拟揭示了土与结构接触面的渐进累积破坏过程,说明了接触面模型与平均剪应力–剪切位移试验曲线的差异,并对模型本构参数的选取进行了阐述。
Firstly, the meanings of the contact surface of the soil and the composition of the relative displacement of the contact surface and the failure form of the contact surface are discussed. Then, the cohesion zone model is used to describe the sliding and fracture failure of the contact surface. The adjacent contact surface unit describes the basic deformation of the contact surface , A non-thickness contact surface unit based on the agglomeration area model is established, which effectively avoids the difficulty of determining the contact surface thickness. After the numerical realization of the contact surface model is completed within the framework of the FEM (finite element method), the progressive cumulative failure process of the contact surface between the soil and the structure is revealed by the direct shear test. The contact surface model and the average shear stress- Shear displacement test curve differences, and model constitutive parameters selected are described.