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基于热力学理论和临界状态土力学的框架,建立了耗散应力空间内的α-β屈服面。定义耗散势和背应力为应力的函数来实现在真实应力空间非相关联流动。基于边界面模型框架,准确模拟了超固结黏土在初始屈服面内的弹塑性响应。采用临界状态线与边界面交点在静水压力轴上的投影为映射中心,并定义剪胀函数,保证了“干侧”发生剪胀,而“湿侧”发生剪缩。与Boston Blue Clay,Lower Cromer Till和London Clay 3种土在不排水条件下的三轴试验数据进行对比,验证了模型的合理性和有效性。
Based on the theory of thermodynamics and the framework of soil mechanics in critical state, the α-β yield surface in dissipative stress space is established. Define the dissipation potential and back stress as a function of stress to achieve non-correlated flow in real stress space. Based on the boundary model framework, the elastic-plastic response of the overconsolidated clay in the initial yield surface is accurately simulated. Using the projection of the intersection point between the critical state line and the boundary surface on the hydrostatic pressure axis as the mapping center and defining the dilatancy function, dilatancy of “dry side ” occurs and “wet side ” shrinks. Compared with the triaxial test data of undrained condition of Boston Blue Clay, Lower Cromer Till and London Clay, the model is validated and validated.