摘要
潜蚀是引起堤防和大坝等水利工程破坏的重要因素之一。为了深入探究潜蚀在细观尺度上的发生与发展机理,采用离散元(DEM)与计算流体力学(CFD)耦合的方法建立了土体潜蚀细观分析模型,以探讨水力梯度和细颗粒含量对土体潜蚀的影响,并分析细颗粒流失量、流失区域及力链数量等参数的变化规律。结果表明:潜蚀的发展过程可分为启动、发展、侵蚀和稳定4个阶段;在相同的细颗粒含量下,水力梯度越大,细颗粒流失速度越快;在相同水力梯度条件下,渗流初期细颗粒的流失速度随细颗粒含量增加而减小,但其累积流失量则随之增大;潜蚀开始时,颗粒流失首先出现在渗流出口处,随后逐渐从土体两端向中心扩展;随着样品中细颗粒的流失,颗粒体系内细颗粒接触链的数量减少,而粗颗粒接触链数量基本保持不变。
Suffusion is one of the important factors contributing to the destruction of water conservancy projects such as dikes and dams.In order to explore the occurrence and development mechanism of suffusion on the mesoscale,a mesoscopic analysis model of soil suffusion was established by coupling discrete element method(DEM)with computational fluid dynamics(CFD).The effects of hydraulic gradient and fine particle content on soil suffusion were investigated to analyze the variation rules of fine particle loss,loss area and the number of force chains.The results show that the development process of suffusion can be divided into four stages:initiation,development,erosion and stabilization.Under the same fine particle content,the larger the hydraulic gradient is,the greater the fine particle loss rate become.Under the same hydraulic gradient,the loss rate of fine particles decreases with the increase of fine particle content at the initial stage of seepage,while the cumulative loss increases.At the beginning of suffusion,particle loss first appears at the seepage outlet,and then gradually expands from both ends to the center of the soil mass.With the loss of fine particles in the sample,the number of fine particle contact chains in the particle system decreases,while the number of coarse particle contact chains remains basically unchanged.
作者
王永庆
刘智
熊磊
康捷
任杰
WANG Yongqing;LIU Zhi;XIONG Lei;KANG Jie;REN Jie(River and Lake Management Center of Shangrao City,Shangrao 334000,China;Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China;State Key Laboratory of Water Engineering Ecology and Environment in Arid Area,Xi’an University of Technology,Xi’an 710048,China)
出处
《水资源与水工程学报》
北大核心
2025年第3期175-181,共7页
Journal of Water Resources and Water Engineering
基金
国家重点研发计划项目(2023YFC3012200)
江西省水利厅科技计划项目(202224ZDKT14)
江西省水工安全工程技术研究中心开放基金项目(2022SKSG04)。
关键词
潜蚀
DEM-CFD耦合
细颗粒含量
水力梯度
堤坝
suffusion
discrete element method-computational fluid dynamics(DEM-CFD)coupling
fine particle content
hydraulic gradient
dam
