考虑土体剪胀性和应变软化性的K-G模型

在三轴试验中密实无粘性土具有剪胀性和应变软化性,广泛应用于工程计算的非线性弹性邓肯-张模型、常规的非线性弹性K-G模型等都不能反映土体的这些性质。根据紫坪铺面板堆石坝筑坝料的大量三轴试验研究,分析密实无粘性土的剪胀性和应变软化性,提出了考虑这种剪胀性和应变软化性的K-G模型和模型参数的求取方法;通过预测曲线与试验曲线对比说明模型的合理性。模型适应多种应力路径,参数可方便地求取,可以在有限元应力-应变分析中推广运用。

Containing dilatancy and strain softening of earth''''s K-G model

The dense no viscous earth takes on the dilatancy and strain softening in course of the triaxial test. The model used in engineering extensively , such as the nonlinear elastic Duncan-Chang model and the general nonlinear elastic K-G model, do not contain the characters. According to a great deal of data by the triaxial test and research of Zipingpu Reservoir Concrete Faced Rockfill Dam’s material, the dilatancy and strain softening of the dense no viscous earth are analysed. The K-G model that contains the dilatancy and strain softening of the earth and the method to obtain the model’s parameters are introduced. The comparison between the theoretical and the experimental volumetric strain-shear strain curves verifies the rationality of the model .The model adapts to various stress path and obtains the parameters expediently, and can be used in FEM stress-strain analysis.