基于e—p曲线的邓肯—张模型建立及参数灵敏度分析

Establishment of Duncan-Chang Model and Analysis on Parameters Sensitivity Based on e—p Curve

邓肯—张模型是有限元计算中的常见模型,其模型参数一般需要做三轴排水试验来确定,但某些情况下,并不具备试验的条件。基于土体的e—p曲线,给出计算邓肯—张模型参数的简单方法,并与传统土力学方法计算结果进行对比,证明其可行性。对于未能确定的参数进行灵敏度的分析,给出其与土体沉降量之间的定性关系。为缺乏试验资料的一般岩土工程的有限元计算提供一些参考。

Duncan-Chang model is a common model in the calculation of finite element method,its model parameters are usually defined by a triaxial-draining experiment,but sometimes it＇s unable to do this experiment. This article provided an easy method based on e—p curve to calculate the model parameters of Duncan-Chang model. At the same time,the results were compared with the traditional soil mechanics to show its feasibility. For the parameters can not be determined,the qualitative relationship between model parameters and embankment of soil was proposed. All this can provide some guidance for the FEM calculation of general geotechnical engineering.