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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、剪缩特性
In order to solve the problem that there are many parameters of elastic-plastic model in Tsinghua University and difficult to determine the parameters, the elastoplastic model of soil with the function of plastic work Wp as the hardening parameter is proposed based on the test data of Yongding river sand. The method of determining the model parameters by the isotropic compression test and the conventional triaxial test is given. The model can be used to analyze three-dimensional stress state. The predicted curve of the stress-strain relationship of the middle Miyong Yongding sand is compared with the experimental curve by using the model. The results show that it can simulate the dilatancy and shear-shrinkage characteristics of sand deformation well