Numerical simulation of the critical hydraulic gradient of granular soils at seepage failure by discrete element method and computational fluid dynamics

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2024-02-04 DOI:10.1016/j.jher.2024.02.001
Yuqi Li , Liangchen Xu , Zhuyin Ma , Bingbing Ma , Junhao Zhang
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Abstract

Seepage failure is a common problem in engineering, and the calculation and analysis of critical hydraulic gradient are of great significance for the safety and protection of engineering. Based on the principle of discrete element method and computational fluid dynamics, the fluid–solid coupled models were established to study the critical hydraulic gradient and particle loss rate of granular soils at seepage failure. The evolution of seepage failure was divided into four stages: seepage development stage, local damage stage, volume expansion stage and overall damage stage. The validity of numerical simulation was demonstrated by comparing the critical hydraulic gradient obtained by numerical simulation and by Terzaghi’s formula. According to the fabric damage and flow velocity variation of the models at seepage failure, the influences of model size and particle size on the critical hydraulic gradient and particle loss rate were analyzed. The results indicate that critical hydraulic gradient and particle loss rate were not sensitive to changes in model size. A wide particle size distribution range resulted in large critical hydraulic gradient and small particle loss rate at seepage failure. The discrete element numerical simulation can not only be used to determine the critical hydraulic gradient of geotechnical and hydraulic engineering, but also offer a visual portrayal of the evolution of seepage failure, serving as an important complement to comprehend the intricate microscopic mechanisms underlying soil seepage failure.

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利用离散元法和计算流体力学对渗流破坏时颗粒土的临界水力梯度进行数值模拟
渗流破坏是工程中的常见问题,临界水力梯度的计算与分析对工程的安全防护具有重要意义。基于离散元法和计算流体力学原理,建立了流固耦合模型,研究了颗粒土在渗流破坏时的临界水力梯度和颗粒损失率。渗流破坏的演变过程分为四个阶段:渗流发展阶段、局部破坏阶段、体积膨胀阶段和整体破坏阶段。通过比较数值模拟和 Terzaghi 公式得出的临界水力梯度,证明了数值模拟的有效性。根据渗流破坏时模型的织物破坏和流速变化,分析了模型尺寸和颗粒大小对临界水力梯度和颗粒损失率的影响。结果表明,临界水力坡度和颗粒损失率对模型尺寸的变化并不敏感。粒径分布范围大,则渗流破坏时临界水力梯度大,颗粒损失率小。离散元数值模拟不仅可用于确定岩土工程和水利工程的临界水力梯度,还能直观地描述渗流破坏的演变过程,是理解土壤渗流破坏的复杂微观机理的重要补充。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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