Elastoplastic constitutive model for overconsolidated clays with an advanced dilatancy relation

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-07-03 DOI:10.1002/nag.3803

Kehao Chen, Rui Pang, Bin Xu, Xingliang Wang

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Abstract

The dilatancy behavior of overconsolidated (OC) clays is a key factor in determining their strength and deformation characteristics. Recognizing the limitations of previous dilatancy relations for OC clays, a novel dilatancy relation is proposed that can effectively capture the changes in dilatancy point, volume dilatancy and contraction with the overconsolidation ratio (OCR). As OC clays revert to the normally consolidated (NC) state, the proposed dilatancy relation smoothly transitions to that of the modified Cam-clay (MCC) model, ensuring a unified description of the dilatancy relation between OC and NC clays. The dilatancy relation can be easily incorporated into the constitutive model of different theoretical frameworks. Subsequently, this advanced dilatancy relation is integrated into a new elastoplastic constitutive model for OC clays within the framework of bounding surface and generalized plasticity theory. The validity of the proposed model is confirmed through drained triaxial compression and extension, undrained triaxial compression and extension, as well as complex stress path tests for clays with various OCRs, and the simulation results of the proposed model are compared with those of the SANICLAY model. The comparative analysis demonstrate that the model performs well in simulating the behavior of OC clays.

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具有高级膨胀关系的过固结粘土弹塑性结构模型

过度固结（OC）粘土的膨胀行为是决定其强度和变形特性的关键因素。鉴于以往 OC 粘土稀释关系的局限性，我们提出了一种新型稀释关系，它能有效捕捉稀释点、体积稀释和收缩随超固结比（OCR）的变化。当 OC 粘土恢复到正常固结（NC）状态时，所提出的稀释度关系可平滑过渡到修正的卡姆粘土（MCC）模型，从而确保统一描述 OC 和 NC 粘土之间的稀释度关系。这种膨胀关系可以很容易地纳入不同理论框架的构成模型中。随后，在约束面和广义塑性理论的框架内，将这种先进的膨胀关系整合到 OC 粘土的新弹塑性组成模型中。通过对具有不同 OCR 的粘土进行排水三轴压缩和拉伸、不排水三轴压缩和拉伸以及复杂应力路径试验，证实了所提模型的有效性，并将所提模型的模拟结果与 SANICLAY 模型的模拟结果进行了比较。比较分析表明，该模型在模拟 OC 粘土行为方面表现良好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.