无粘性土的应力矢量本构模型(Ⅱ)——应用

A Stress Vector-based Constitutive Model for Cohesionless Soil (Ⅱ)-Application

将史宏彦等提出的无粘性土的应力矢量本构模型应用于分析多种复杂应力路径下材料的变形问题· 结果表明 ,此模型不仅能够很好地反映无粘性土的应力应变非线形、硬化性、剪缩剪胀性、与应力路径的相关性、主应力与主应变增量方向之间的非共轴性以及球偏应力与变形的耦合性等主要变形特性 ,而且也能够同时考虑主应力轴的旋转和中主应力对土的变形及强度的影响· 模型预测结果与试验结果之间的良好吻合表明了该模型的广泛适用性·

The stress vector_based constitutive model for cohesionless soil, proposed by SHI Hong_yan et al, was applied to analyze the deformation behaviors of materials subjected to various stress paths. The result of analysis shows that the constitutive model can capture well the main deformation behavior of cohesionless soil, such as stress_strain nonlinearity, hardening property, dilatancy, stress path dependency, non_coaxiality between the principal stress and the principal strain increment directions, and the coupling of mean effective and deviatoric stress with deformation. In addition, the model can also take into account the rotation of principal stress axes and the influence of intermediate principal stress on deformation and strength of soil simultaneously. The excellent agreement between the predicted and measured behavior indicates the comprehensive applicability of the model.