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在深入研究修正剑桥模型和统一硬化模型(UH模型)基本特性的基础上,揭示模型描述超固结土特性的机理。对于超固结土,修正剑桥模型的预测曲线存在突变,不能很好地模拟土体连续、渐近的变形过程;对于重超固结土,模型预测的排水路径条件下的峰值强度很高,与实测结果偏差较大。修正剑桥模型不能模拟真三轴试验的应力-应变关系。UH模型的参数与修正剑桥模型相同,通过采用基于空间滑动面准则(SMP准则)的变化应力方法,模型能够合理描述在三轴压缩、三轴伸长和真三轴条件下超固结土的剪胀、硬化和软化特性。
On the basis of deeply studying the basic characteristics of modified Cambridge model and unified hardening model (UH model), the mechanism of model describing the characteristics of overconsolidated soil is revealed. For overconsolidated soil, there is a sudden change in the predicted curve of the modified Cambridge model, which can not well simulate the continuous and asymptotic deformation process of the soil. For the heavily overconsolidated soil, the predicted peak intensity of the drainage path under the model is very high, Deviations from the measured results. The modified Cambridge model can not simulate the stress-strain relationship of true triaxial tests. The parameters of the UH model are the same as those of the modified Cambridge model. The model can reasonably describe the behavior of overconsolidated soil under triaxial compression, triaxial elongation and true triaxial conditions by using the variation stress method based on the SMP criterion Dilatancy, hardening and softening properties.