以塑性功函数为硬化参数的土的弹塑性模型

Elasto-plastic model of soil with a function of plastic work as the hardening function

为解决清华弹塑性模型参数多和参数确定困难的问题 ,以永定河砂试验资料为基础 ,提出了以塑性功 Wp 的函数为硬化参数的土的弹塑性模型。给出了模型参数用等向压缩试验和常规三轴试验确定的方法。模型可用于三维应力状态的分析。应用所建模型对中密永定河砂的应力应变关系预测曲线与试验曲线进行比较 ,结果表明它可以较好模拟砂土变形的剪胀。

In view of the difficulty of determining the parameter of Tsinghua Elasto plastic Model proposed by Huang Wenxi, a elasto plastic model with a function of plastic work as the hardening function and the method which is used to determine the parameter of the modified model were proposed in this paper. The parameters of this model required to characterize the soil behavior can be derived entirely from results of isotropic compression and conventional triaxial compression tests, but the model is applicable to general 3 D stress conditions. The comparison between the measured and predicted stress strain and volume change behavior for Yongding River sand shows that the model predicts soil behavior shear compression and dilation with good accuracy.