A novel constitutive model of the anisotropic sand accounting for the fabric evolution

IF 5.3 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2024-09-30 DOI:10.1016/j.compgeo.2024.106797

Zhicheng Gao , Pengcheng Ma , Yao Tang , Yunmin Chen , Qiang Ma

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引用次数: 0

Abstract

The mechanical behavior of the sand is affected by anisotropy. This paper presents a novel constitutive model for anisotropic sand that accounts for fabric evolution. In this proposed model, a novel hardening parameter and a new state variable are introduced to capture the effects of the evolving anisotropic fabric. A universal fabric tensor evolution law, independent of specific fabric tensors, is proposed based on the characteristics of the unified hardening model and the findings from discrete element simulations. Additionally, a dilatancy anisotropy compression line (DACL) is defined to compute the state variable, ensuring the uniqueness of the critical state line (CSL). The proposed model has been validated through a large number of monotonic shear datasets obtained from experiments and DEM simulations, while parameters in this proposed model are physically meaningful and easy to be determined. Analysis of fabric evolution under different loading paths indicates that the undrained triaxial compression test is the most effective for reaching the critical state, providing a useful reference for the critical state soil mechanics.

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各向异性砂的新型结构模型，考虑到织物的演变

砂的力学行为受到各向异性的影响。本文针对各向异性砂提出了一种新的结构模型，该模型考虑了砂的结构演变。在该模型中，引入了一个新的硬化参数和一个新的状态变量，以捕捉各向异性结构演变的影响。根据统一硬化模型的特点和离散元模拟的结果，提出了一种独立于特定织物张量的通用织物张量演化规律。此外，还定义了扩张各向异性压缩线（DACL）来计算状态变量，确保临界状态线（CSL）的唯一性。通过实验和 DEM 模拟获得的大量单调剪切数据集验证了所提出的模型，同时该模型中的参数具有物理意义，易于确定。对不同加载路径下织物演变的分析表明，不排水三轴压缩试验对达到临界状态最为有效，为临界状态土壤力学提供了有益的参考。

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

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.