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等应力增量比路径单剪试验条件下,部分土体与结构接触面表现出明显的应变软化和剪胀特性。基于广义位势理论,将土与结构的接触面问题看作应力空间上的二维问题,势函数取法向应力和切向应力,用塑性状态方程取代传统的屈服面,建立等应力增量比路径条件下的土与结构接触面应力-应变软化模型。采用指数函数,拟合单向压缩试验中法向应力与法向应变的关系,采用复合指数函数,拟合应力比与切向应变的关系,采用另一复合指数函数,拟合法向剪胀分量与切向应变的关系。通过对拟合函数进行微分,确定模型中待定系数的求解方法。结合试验结果对模型进行验证,模型拟合效果良好,具有一定的合理性。
Under the condition of single shear test under constant stress increment ratio, the contact surface between some soil and structure shows obvious strain softening and dilatancy characteristics. Based on the generalized potential theory, the problem of the contact surface between soil and structure is regarded as a two-dimensional problem in stress space. The potential function takes the stress of normal direction and the tangential stress, and replaces the traditional yield surface with plastic state equation to establish the equivalent stress increment ratio Stress - strain softening model of soil - structure interface under path condition. The exponential function is used to fit the relationship between the normal stress and the normal strain in the uniaxial compression test. The complex exponential function is used to fit the relationship between the stress ratio and the tangential strain. Another composite exponential function is used to fit the normal dilatancy component Relationship with Tangential Strain. By differentiating the fitting function, the solution method of the undetermined coefficient in the model is determined. Combined with the test results to verify the model, the model fitting effect is good, with a certain rationality.