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针对传统砂土本构理论无法合理解析剪破角随初始围压增加而减少这一试验规律的局限性,采用材料状态相关砂土临界状态本构模型对Hostun砂进行了应变局部化分析。首先基于已有的材料状态相关砂土临界状态概念,将Pietruszczak等所提出的砂土本构模型进行了改进,并利用Hostun砂的有关三轴排水试验结果对模型参数进行了拟合,然后对Hostun砂的平面应变排水试验进行了应变局部化分析。分析结果表明:基于材料状态相关的砂土临界状态模型能够合理地描述材料初始状态对砂土变形局部化的影响,尤其是初始有效围压对剪破角的影响。
In view of the limitation that the conventional constitutive theory of sand can not reasonably resolve the experimental law that the shear failure angle decreases with the increase of initial confining pressure, the strain localization analysis of Hostun sand is carried out based on the constitutive model of material-state-related criticality of sand. Firstly, based on the existing concept of critical state of material-related sand, Pietruszczak et al. Proposed the improvement of constitutive model of sand, and used the results of Hostun sand for triaxial drainage test to fit the model parameters. Then, Hostun sand plane strain drainage test conducted strain localization analysis. The analysis results show that the influence of material initial state on the deformation of sand soil, especially the effect of initial effective confining pressure on the shear failure angle, can be reasonably described based on the material state related sand critical state model.