基于微观破损规律的结构性土本构模型

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。

Constitutive model for structured soils based on microscopic damage law

Based on the framework of breakage mechanics for geological materials, a constitutive model for structured soils is proposed considering the micro-mechanism of the destructuring effects. The influence of soil structure on the mechanical behaviors is considered by employing a structural yielding surface similar to that for reconstituted soils in geometry. A damage parameter modeling the soil structure damage is used in the hardening law for structured soils. The damage parameter proposed based on the concept of sharing of stress and strain in micro-scale has tangible mechanical denotation and the cooperation of plastic volumetric strain and principal axial strain is considered in the hardening law, thus this model can properly describe the transformation of soils from intact state to reconstituted state. The validity of the proposed model is verified by predicting the mechanical behaviors of natural and artificially cemented clays in the consolidation tests and triaxial compression tests.