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在已发展的考虑颗粒破碎效应的静力UH本构模型基础上,采用变换应力方法,将原模型拓展为适用于无黏性土的动力统一硬化模型(DUH模型)。具体做法:①针对静力模型中屈服面形状随当前应力状态变化而改变的现状,采取含有p变换的变换应力方法,将原真实应力空间中变化的屈服面变换为变换应力空间中的椭圆屈服面;②采用旋转硬化规则,在变换应力空间中椭圆的位置以及形状由旋转轴来确定,并建立了一并考虑等向硬化以及旋转硬化的混合硬化参数;③在变换应力空间中,参考屈服面与当前屈服面之间通过应力比参数R来建立联系。模型参数较少。通过3种不同岩土材料在高围压下的单调以及循环加载试验结果的比较,验证了所提DUH模型的合理性。
On the basis of the developed static UH constitutive model considering the effect of particle crushing, a transformation stress method is used to expand the original model into a dynamic unification hardening model (DUH model) for cohesion-free soils. The concrete approach: ①According to the current situation that the yield surface shape changes with the current stress state in the static model, the transformation stress method with p transformation is adopted to transform the yield surface transformed in the original real stress space into the elliptic yield in the transformation stress space Surface; ② using the rules of rotation hardening, the position and shape of the ellipse in the transformation stress space is determined by the rotation axis, and a hybrid hardening parameter that takes into account the isotropic hardening and the rotation hardening is established; ③ In the transformation stress space, The relationship between the surface and the current yield surface is established by the stress ratio R. Less model parameters. Through the comparison of the monotonic and cyclic loading tests of three different geomaterials under high confining pressure, the validity of the proposed DUH model is verified.