粗粒土与结构接触面统一本构模型及试验验证

Unified modeling of soil-structure interface and its test confirmation

在试验基础上建立了一个可统一描述粗粒土与结构接触面力学特性的本构模型。提出了新的建模思路,基于试验得到的接触面本构规律建立了模型的数学公式及参数确定方法。进行了多种法向边界条件下接触面单调和循环剪切试验,采用新建立的模型对试验结果进行了预测,模型预测结果与试验结果吻合良好。该模型参数易于确定,能够统一地描述包括单调与循环加载条件下接触面的应变软化、剪胀规律、异向性等主要力学特性,能够合理地考虑受载过程中接触面的物态及相应力学特性的演化,能够统一地描述低法向应力到高法向应力范围内接触面的力学响应。

An elasto-plasticity damage constitutive model （EPDI model） was developed to unitedly characterize monotonic and cyclic behavior of interface between structure and coarse grained soil. A new model framework was presented and as a result the formulation and parametes determination of the model were set up based on the constitutive rules from test results. The monotonic and cyclic shear tests of the interface under various normal boundary conditions were conducted and also predicted with EPDI model. The predicted results were in good agreement with the test results. Thus, the effectiveness of EPDI model was confirmed to reasonably describe the fundamental behaviors of the interface, including coupling of shear and volumetric strains, evolution of physical state, aeolotropy of response, and influence of normal stress.