Influence of gradation on shear behavior and pore water response of sand

IF 6.2 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-09-30 DOI:10.1016/j.compgeo.2025.107674

Mohammed Elnur, Khalid A. Alshibli

{"title":"Influence of gradation on shear behavior and pore water response of sand","authors":"Mohammed Elnur, Khalid A. Alshibli","doi":"10.1016/j.compgeo.2025.107674","DOIUrl":null,"url":null,"abstract":"<div><div>This paper examines the influence of particle size distribution (PSD) on the shearing behavior of sand using axisymmetric triaxial compression (ATC) testing in conjunction with 3D imaging using synchrotron micro-computed tomography (SMT). Angular sand was sieved to obtain a narrow gradation (uniform) and a wide gradation (non-uniform) with uniformity coefficients (<span><math><mrow><msub><mi>C</mi><mi>u</mi></msub></mrow></math></span>) of 1.2 and 3.0, respectively. Experiments were conducted under drained conditions and a constant effective cell pressure (<span><math><mrow><msubsup><mi>σ</mi><mrow><mn>3</mn></mrow><mo>′</mo></msubsup></mrow></math></span>) of 50 kPa at low and high back pressures (BP). Results of paired ATC-SMT were analyzed in terms of global constitutive behavior, strain localization, and localized flow characteristics. A new particle tracking algorithm is developed to expose strain localization. Relative particle translation gradient (RPTG) results revealed that gradation affects how early the shear band develops and a tendency for narrow gradation to exhibit varying degrees of diffused shear band at high axial strain (<span><math><mrow><msub><mi>ε</mi><mn>1</mn></msub></mrow></math></span>) even though a clear single shear band was observed at the peak strength. Geometric tortuosity (<span><math><mrow><mi>τ</mi></mrow></math></span>) is used as a quantitative parameter to assess flow changes and the efficiency of the flow path. Representative elementary volumes (REVs) inside and outside the shear band were analyzed and the results showed a variation in flow path characteristics where wide gradation specimens had preferential flow paths.</div></div>","PeriodicalId":55217,"journal":{"name":"Computers and Geotechnics","volume":"189 ","pages":"Article 107674"},"PeriodicalIF":6.2000,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Computers and Geotechnics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0266352X25006238","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS","Score":null,"Total":0}

引用次数: 0

Abstract

This paper examines the influence of particle size distribution (PSD) on the shearing behavior of sand using axisymmetric triaxial compression (ATC) testing in conjunction with 3D imaging using synchrotron micro-computed tomography (SMT). Angular sand was sieved to obtain a narrow gradation (uniform) and a wide gradation (non-uniform) with uniformity coefficients (

C_{u}

) of 1.2 and 3.0, respectively. Experiments were conducted under drained conditions and a constant effective cell pressure (

σ_{3}^{'}

) of 50 kPa at low and high back pressures (BP). Results of paired ATC-SMT were analyzed in terms of global constitutive behavior, strain localization, and localized flow characteristics. A new particle tracking algorithm is developed to expose strain localization. Relative particle translation gradient (RPTG) results revealed that gradation affects how early the shear band develops and a tendency for narrow gradation to exhibit varying degrees of diffused shear band at high axial strain (

ε_{1}

) even though a clear single shear band was observed at the peak strength. Geometric tortuosity (

τ

) is used as a quantitative parameter to assess flow changes and the efficiency of the flow path. Representative elementary volumes (REVs) inside and outside the shear band were analyzed and the results showed a variation in flow path characteristics where wide gradation specimens had preferential flow paths.

查看原文本刊更多论文

级配对砂土剪切特性及孔隙水响应的影响

本文采用轴对称三轴压缩（ATC）试验，结合同步加速器微计算机断层扫描（SMT）三维成像技术，研究了粒径分布（PSD）对砂土剪切特性的影响。角砂筛分得到窄级配（均匀）和宽级配（不均匀），均匀系数（Cu）分别为1.2和3.0。在低背压（BP）和高背压（BP）条件下，在排水条件下，恒定的有效槽压（σ3’）为50 kPa。配对ATC-SMT的结果在整体本构行为、应变局部化和局部流动特征方面进行了分析。提出了一种新的粒子跟踪算法来揭示应变局部化。相对颗粒平移梯度（RPTG）结果表明，在高轴向应变（ε1）时，尽管在峰值强度处存在明显的单一剪切带，但级配影响剪切带形成的早早程度，窄级配倾向于呈现不同程度的扩散剪切带。几何扭曲度（τ）作为定量参数来评估流动变化和流道效率。对剪切带内外代表性的基本体积（REVs）进行了分析，结果表明，宽级配试件的流道特征存在差异，宽级配试件具有优先流道。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.