Abstract This paper presents a new rate-dependent hypoplastic constitutive model for overconsolidated clays. The model is developed based on a basic hypoplastic model proposed recently for sand. New density and stiffness factors are introduced to account for history dependence. The Matsuoka-Nakai failure surface is incorporated for the limit stress criterion. With six constitutive parameters, the model is capable of predicting the hardening/softening, shear dilation/contraction, and asymptotic state for overconsolidated clays. Comparison between numerical predictions and experimental results shows this model can properly describe the main features of both reconstituted and undisturbed clays with different overconsolidation ratios.

中文翻译：

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超固结粘土基本发育不良模型的扩展

摘要 本文提出了一种新的超固结粘土低塑性本构模型。该模型是基于最近提出的用于沙子的基本发育不良模型开发的。引入了新的密度和刚度因子来解释历史相关性。Matsuoka-Nakai 破坏面包含在极限应力准则中。通过六个本构参数，该模型能够预测超固结粘土的硬化/软化、剪切膨胀/收缩和渐近状态。数值预测与实验结果的对比表明，该模型能够较好地描述不同超固结比的重建粘土和原状粘土的主要特征。