基于统计损伤理论的饱和土邓肯-张修正模型

为了描述饱和土变形过程，以某边坡饱和土为研究对象，开展固结排水三轴压缩试验。试验发现饱和土的应力-应变曲线近似为双曲线，由此选择邓肯-张模型作为基础模型，结合统计损伤理论，构建一种新的饱和土邓肯-张修正模型。通过邓肯-张模型自身特性及线性回归的方法，求解模型参数。采用所建模型对饱和土试验数据进行辨识，对比分析试验曲线和理论曲线。结果表明，所建修正模型结构简练，参数较少，能较为准确地辨识饱和土偏应力-应变曲线，具有一定的可行性和合理性。

Duncan-Chang modified model of saturated soil based on statistical damage theory

To describe the deformation process of saturated soil, a consolidation drainage triaxial compression test was performed with saturated soil of a slope as the research object. The stress-strain curve of saturated soil was found to be approximately hyperbolic.Thus, Duncan-Chang model was chosen as the basic model, and a new modified model of Duncan-Chang model was constructed based on statistical damage theory. Through Duncan-Chang model′s own characteristics and linear regression method, the model parameters were solved. The test data of saturated soil is identified using the built model, as well as the test and theoretical curves, were compared and analyzed. Results showed that the modified model has a simple structure and fewer parameters and can accurately identify the deviatoric stress-strain curve of saturated soil.