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在UH(统一硬化)模型的基础上,基于部分塑性体积应变与塑性剪应变有耦合的思路,把对土塑性变形有影响的硬化参量分为耦合硬化参量和非耦合硬化参量,提出了一个新的双硬化的弹塑性本构模型.此模型新颖之处在于它不但可以有效的考虑应力路径也可以考虑应变路径对应力应变特性的影响,所以新模型既能合理预测排水、不排水,也可以模拟部分排水及部分吸水条件下的应力应变关系.结合渐近状态概念,还给出了基于饱和砂土排水试验参数计算不排水极限应力比、静止土压力系数K0的简单公式.模型参数简单,仅比Cam-clay模型多了一个特征状态点应力比,全部可通过常规三轴压缩试验简单确定.
Based on UH (unified hardening) model, based on the idea of coupling partial plastic volumetric strain with plastic shear strain, the influence of plastic deformation on soil plastic deformation is divided into coupling and non-coupling hardening parameters, and a new Of the dual-hardening elastic-plastic constitutive model.The novelty of this model is that it not only can effectively consider the stress path but also can consider the influence of the strain path on the stress-strain characteristics, so the new model can not only predict the drainage, undrained, Simulate partial drainage and partial water stress conditions.According to the concept of asymptotic state, a simple formula for calculating undrained ultimate stress ratio and static earth pressure coefficient K0 based on saturated sand drainage test parameters is also given.The model parameters are simple, There is only one more characteristic state-point stress ratio than the Cam-clay model, all of which can be easily determined by conventional triaxial compression tests.