Effect of non-erodible particle content on the mechanism of suffusion and the evolution of permeability of sandy soil

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Jie Kang, Jie Ren, Songtao Hu, Hengle Guo, Kaixuan Chen, Ting Zhuang, Shenghao Nan, Jiaheng Sui
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引用次数: 0

Abstract

Suffusion is a typical type of internal erosion that is an important factor leading to the failure of dams and dikes. In this paper, fine particles are divided into erodible particles and non-erodible particles, and the soil suffusion mechanism is investigated by laboratory tests and CFD_DEM simulations when the content of erodible particles (Fc) and non-erodible particles (Fz) is 15% and 5%, 10% and 10%, and 5% and 15%. The global mean permeability coefficient (kav) and local permeability coefficient (ki–j) were calculated by monitoring the water head in the seepage path of the sample. The results show that with increasing non-erodible particle content, the difficulty of soil suffusion increases gradually. When soil suffusion occurs, the loss of fine particles starts from the seepage outlet area and the influent area, and the non-erodible particles have little influence on the particle loss process in these two areas. After the occurrence of suffusion, the number of weak contact chains is obviously reduced, while the strong contact chains are basically stable. When Fz = 5% and Fz = 10%, the average permeability coefficient of the soil after suffusion expands to 2.21–1.60 times that of the initial state, and the corresponding values of the CFD_DEM simulation are 2.14–1.86 times.

Abstract Image

不腐烂颗粒含量对砂土窒息机制和渗透性演变的影响
侵蚀是一种典型的内部侵蚀,是导致水坝和堤防溃决的重要因素。本文将细颗粒分为可侵蚀颗粒和不可侵蚀颗粒,通过实验室试验和 CFD_DEM 模拟研究了当可侵蚀颗粒(Fc)和不可侵蚀颗粒(Fz)的含量分别为 15%和 5%、10%和 10%、5%和 15%时的土壤窒息机理。通过监测样品渗流路径上的水头,计算出了全局平均渗透系数(kav)和局部渗透系数(ki-j)。结果表明,随着不可腐蚀颗粒含量的增加,土壤窒息的难度逐渐增大。土壤窒息发生时,细颗粒的流失从渗流出口区和进水区开始,非难降解颗粒对这两个区域的颗粒流失过程影响不大。发生窒息后,弱接触链数量明显减少,而强接触链基本稳定。当 Fz = 5%和 Fz = 10%时,窒息后土壤的平均渗透系数扩大到初始状态的 2.21-1.60 倍,CFD_DEM 模拟的相应值为 2.14-1.86 倍。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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