A hypoplastic constitutive model for clays
A hypoplastic constitutive model for clays
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DOI：
10.1002/nag.416
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发表时间：
2005-04-10
影响因子：
4
通讯作者：
Masín, D
中科院分区：
文献类型：
--
作者：
Masín, D
本文提出了一种新的粘土本构模型。该模型建立在广义亚塑性原理的基础上，并与传统的临界状态土力学相结合。各向同性法向压缩线和临界状态线的位置对应于修正的凸轮粘土模型，以松冈-中井破坏面作为极限应力判据，不同超固结比土体的非线性行为由广义亚塑性公式描述，该模型需要5个本构参数，它们与修正的凸轮粘土模型的参数相对应，易于根据标准室内试验进行标定。这使得该模型特别适合于实际应用。基本模型可以简单地通过晶间应变的概念来改进，该概念允许在非常小的应变下再现行为。该模型是基于伦敦重塑粘土的高质量实验室实验进行评估的。与参考的亚塑性关系相反，所提出的模型可以应用于高度超固结粘土。在不同应力水平的小应变范围内的预测也得到了改进。版权所有(C)2005 John Wiley&Sons，Ltd.
This paper presents a new constitutive model for clays. The model is developed on the basis of generalized hypoplasticity principles, which are combined with traditional critical state soil mechanics. The positions of the isotropic normal compression line and the critical state line correspond to the Modified Cam clay model, the Matsuoka-Nakai failure surface is taken as the limit stress criterion and the non-linear behaviour of soils with different overconsolidation ratios is governed by the generalized hypoplastic formulation.The model requires five constitutive parameters, which correspond to the parameters of the Modified Cam clay model and are simple to calibrate on the basis of standard laboratory experiments. This makes the model particularly suitable for practical applications. The basic model may be simply enhanced by the intergranular strain concept, which allows reproducing the behaviour at very small strains. The model is evaluated on the basis of high quality laboratory experiments on reconstituted London clay. Contrary to a reference hypoplastic relation, the proposed model may be applied to highly overconsolidated clays. Improvement of predictions in the small strain range at different stress levels is also demonstrated. Copyright (c) 2005 John Wiley & Sons, Ltd.