基于三轴试验确定邓肯-张模型参数的一种数据处理方法

邓肯-张非线性模型已经被广泛的应用与工程实践的应力-应变数值模拟分析中。邓肯-张模型具体有K、n、Rf、c、等材料参数。本文基于杭州湾地区海相软土多组土样的三轴剪切试验数据，来确定邓肯-张模型参数。发现一些参数的离散性太大，这使得参数的数值选取比较困难，进而会影响模型在工程实践中的应用，而究其原因主要破坏比Rf的取值变化引起的。这里提出了一种针对邓肯-张模型参数离散性较大的数据处理方法，即假定破坏破坏比Rf为一定值，进而来求取其他离散性较大的参数。这种数据处理方法既可以简化模型计算，又可以提高模型计算的效率和精确度。

THE DATA PROCESSING METHOD OF DETERMINING DUNCAN-CHANG MODEL PARAMETERS BASED ON TRIAXIAL TEST

Duncan-Chang nonlinear model has been widely used in numerical analysis of stress-strain in engineering. Duncan-Chang model has K、n、Rf、c、 and other material parameters. These parameters of Duncan-Chang model are confirmed through analysis of triaxial test data in the Hangzhou Bay area. In the calculation process, it is found that the discreteness of some parameters is too large, so that the selection of parametersis more difficult, and the application of the model in engineering is also affected, the main reason is that the change of the value of Rf. We put forward a method, it is assumed that the value of Rf is a certain value, and then to obtain other parameters. This data processing method can not only simplify the model calculation, but also can improve the efficiency and accuracy of the model calculation.