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本文对增量非线性模型进行了一般的讨论,指出了这类模型和其它一些模型的差别和联系,澄清了一些基本概念。文中介绍了土的非线性剪胀应力-应变模型,用一种砂样的试验数据确定KKG、KG和Ev三种模型的模量。对用这些模型计算的值与相应的试验值进行了比较和分析。结果表明,KKG模型的拟合能力和预测能力都较强,尤其是它能较好地模拟土的剪胀行为,预计的孔隙压力和有效应力路经与试验结果也比较吻合。这也说明,对一般的增量非线性模型作适当简化所得到的模型,是能在一定程度上较好地描述土的本构力学特性的。
This paper discusses the incremental non-linear model in general and points out the differences and connections between this type of model and other models, and clarifies some basic concepts. In this paper, the nonlinear dilatant stress-strain model of soil is introduced. The test data of a sand sample are used to determine the moduli of KKG, KG and Ev models. The values calculated using these models were compared and analyzed with the corresponding experimental values. The results show that the KKG model has strong ability of fitting and prediction, especially it can well simulate the dilatancy behavior of soil. The predicted pore pressure and effective stress path are also consistent with the experimental results. This also shows that the model obtained by properly simplifying the general incremental nonlinear model can describe the constitutive mechanical properties of the soil to a certain extent.