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基于所提出的岩土材料统一各向同性破坏准则,通过引入椭圆-抛物双屈服面模型以及结构性损伤屈服面,结合复合体损伤概念,建立了三维主应力空间中弹塑性损伤本构模型,该模型能够反映结构性软土应力应变的非线性、剪胀剪缩特性、结构性以及中主应力对变形的影响。通过结构性软土试验结果与模型的计算结果对比分析,表明该模型能够较好地预测结构性软土三维空间的应力-应变特性。
Based on the unified criterion of isotropic damage of geomaterials, an elasto-plastic damage constitutive model of three-dimensional principal stress space is established by introducing the elliptical-parabolic dual yield surface model and the structural damage yield surface, combined with the concept of composite damage. The model can reflect the nonlinear stress-strain of structural soft soil, the dilatancy shear-shrinkage characteristics, the structure and the influence of the middle principal stress on the deformation. By comparing the results of the structural soft soil test with those of the model, it is shown that the model can predict the stress-strain characteristics of the three-dimensional soft clay well.