中文摘要：

由于土壤结构相互作用的复杂性，简单组成的模型典型地使用了因为在一般计算机程序的接口元素不能满足包含不同接口的结构的不连续的变丑分析的要求。以便模仿接口的弄软紧张的特征，一个非线性的弄软紧张的接口组成的模型在三种尺寸被合并到 continua 的快 Lagrange 分析(通过在 FISH 环境的一个自定义节目的 FLAC ^3D) 。数字模拟一直接砍为 geosynthetic 接口的测试被进行证实接口模型正确地被实现。数字测试的结果显示出好同意，结果从理论计算获得了，显示合并到 FLAC3D 的模型能模仿包含 geosynthetic 材料的接口的非线性的弄软紧张的行为。结果证实了改进接口模型的有效性和可靠性。实现一个接口的过程和方法组成的模型进一个商业计算机程序也为一个新接口的实现提供引用在 FLAC ^3D 的组成的模型。

英文摘要：

Due to the complexity of soil-structure interaction, simple constitutive models typically used for interface elements in general computer programs cannot satisfy the requirements of discontinuous deformation analysis of structures that contain different interfaces. In order to simulate the strain-softening characteristics of interfaces, a nonlinear strain-softening interface constitutive model was incorporated into fast Lagrange analysis of continua in three dimensions （FLAC3D） through a user-defined program in the FISH environment. A numerical simulation of a direct shear test for geosynthetic interfaces was conducted to verify that the interface model was implemented correctly. Results of the numerical tests show good agreement with the results obtained from theoretical calculations, indicating that the model incorporated into FLAC3D can simulate the nonlinear strain-softening behavior of interfaces involving geosynthetic materials. The results confirmed the validity and reliability of the improved interface model. The procedure and method of implementing an interface constitutive model into a commercial computer program also provide a reference for implementation of a new interface constitutive model in FLAC3D.