Viscoelastic-Elastoplastic Analysis of Overconsolidated Structural Soft Soils

IF 3.4 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-12-05 DOI:10.1002/nag.3908

Zhi Yong Ai, Gan Lin Gu, Yuan Hao Jiang

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引用次数: 0

Abstract

Soft soils exhibit significant time-dependent effects during long-term deformation. To precisely describe the long-term behavior of soft soils, it is necessary to employ elastoplastic theory and rheology principles for investigating the stress–strain relationship of the soils. In this paper, a super-subloading modified Cam-clay model is initially derived. Subsequently, by introducing the Kelvin model to describe the creep behavior of soils, and combining it with the modified Cam-clay model, an overconsolidated structural viscoelastic-elastoplastic model is further presented. After converting the equation into matrix form and programming it in Fortran, the proposed model is implemented by ABAQUS. Then, the accuracy of the developed model and program is verified through comparison with existing literature and experimental results. Finally, parametric analysis is conducted to explore the impact of viscoelasticity, structure, and overconsolidation on the responses of soft soils.

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超固结结构软土的粘弹-弹塑性分析

软土在长期变形过程中表现出明显的时间依赖效应。为了准确地描述软土的长期特性，有必要运用弹塑性理论和流变学原理来研究软土的应力-应变关系。本文初步推导了一种超加载修正Cam - clay模型。随后，通过引入Kelvin模型来描述土体的蠕变行为，并将其与修正的Cam - clay模型相结合，进一步提出了超固结结构粘弹弹塑性模型。将方程转化为矩阵形式，用Fortran语言编程后，利用ABAQUS软件实现该模型。然后，通过与已有文献和实验结果的对比，验证了所建立的模型和程序的准确性。最后，通过参数分析探讨粘弹性、结构和超固结对软土响应的影响。

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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.