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在岩土破损力学理论的基础上,通过考虑土体结构性破损的微观机理,建立了结构性土的本构模型。通过定义与重塑土屈服面几何相似的结构性屈服面,模型可以反映结构性对土体力学特性的影响;通过引入表征结构性损伤的破损参数,确定了结构性土加载过程中的硬化规律。该破损参数基于岩土破损力学中应力应变分担的概念而提出,具有明确的力学意义;模型的硬化规律同时考虑了塑性体应变及塑性主应变的影响,可以更好地反映土体结构性损伤过程。将该本构模型用于结构性土室内固结试验及三轴压缩试验结果的模拟,初步验证了该模型的合理性。
Based on the theory of soil damage mechanics, a constitutive model of structural soil is established by considering the microscopic mechanism of soil structural damage. By defining the structural yield surface whose geometry is similar to that of the remodeled soil, the model can reflect the effect of structure on the mechanical properties of the soil. By introducing the damage parameters that characterize the structural damage, the hardening law of the soil during loading . The damage parameter is based on the concept of stress and strain sharing in the geomechanics of rock and soil damage, and has definite mechanical meaning. The hardening law of the model also considers the influence of the plastic strain and the plastic main strain, which can better reflect the structural damage of the soil process. The constitutive model is used to simulate the results of structural soil consolidation test and triaxial compression test. The rationality of the model is verified.