粗粒土与结构接触面三维本构关系及数值模型

Three-dimensional model of interface between structure and coarse grained soil

基于试验结果,探讨了粗粒土与结构接触面的三维力学特性,该接触面在三维剪切时两个方向上的剪应力-应变关系表现出较强的耦合特性,但其主剪应变的大小只与主剪应力的大小有关。基于提出的接触面弹塑性损伤理论,建立了描述三维条件下接触面力学特性的本构模型及其数值格式。编制了有关程序,采用该模型对接触面的力学响应进行了预测。预测结果表明,建立的接触面三维本构关系及数值模型是合理和可行的,能够较好地反映包括剪切耦合特性在内的接触面主要力学特性。

The interface between structure and coarse grained soil was found to exhibit remarkable coupling of shear stress-strain relationship in both the directions due to three-dimensional shear application based on test results. The magnitude of principal shear strain is only dependent on the magnitude of principal shear stress. A three-dimensional constitutive model and its numerical scheme were then developed based on the elastoplasticity damage theory, which was programmed and used to predict the response of soil-structure interface. The model and its numerical scheme were confirmed to reasonably characterize main behaviors including the coupling of shear stress-strain relations of the interface between structure and coarse grained soil, which may have much effect on the response of interface.