基于CFD-DEM耦合的泥水平衡盾构排浆管卵石滞排研究  

Research on pebble slagging stagnation of slurry balance shield drain pipe based on CFD-DEM coupling

作　　者：童里 李达 李树忱 彭科峰 陈祎 TONG Li;LI Da;LI Shuchen;PENG Kefeng;CHEN Yi(School of Qilu Transportation,Shandong University,Jinan 250002,Shandong,China;China Railway Fourth Survey and Design Institute Group Co.,Ltd.,Wuhan 430063,Hubei,China;Institute of Geotechnical and Underground Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学齐鲁交通学院,山东济南250002 [2]中铁第四勘察设计院集团有限公司,湖北武汉430063 [3]山东大学岩土与地下工程研究院,山东济南250061

出　　处：《山东大学学报(工学版)》2025年第2期114-124,共11页Journal of Shandong University(Engineering Science)

基　　金：国家自然科学基金资助项目(51879150,41831278);济南市“高校20条”资助项目(2020GXRC046)。

摘　　要：针对泥水盾构的弯曲管路进行三维建模,利用CFD-DEM耦合进行数值模拟,揭示泥浆携带卵石的运移规律,分析卵石沉积滞排的原因,探究卵石沉积对管道内流场的影响,为现场施工解决滞排问题提供优化指导。结果表明:滞排问题是由于低流速的泥浆提供的拖曳力太低,大量颗粒在管道弯曲处发生了沉积。管道内颗粒进入速度和排出速度将会达到动态平衡,管道弯曲度数越大,颗粒生成速度和排出速度达到动态平衡的临界点越晚,说明颗粒滞排越严重,滞排颗粒数量就越多。颗粒沉积导致有效过流面积变小,泥浆流速发生了明显分层,流场的分层更加不利于底部沉积颗粒的运移,加剧滞排问题。泥浆黏度越大,颗粒和泥浆发生剪切流动时的拖曳力越大,颗粒的平均运移速度越大。泥浆密度对颗粒的水平运移影响不大,但颗粒向上运输时,密度大的泥浆能够提供更高的浮力,有利于防治颗粒的滞排。Three-dimensional modeling was carried out for the curved pipeline of slurry balance shield,and numerical simulation was carried out using CFD-DEM coupling to reveal the migration law of pebbles carried by slurry,analyze the causes of the slagging stagnation of pebbles,explore the influence of pebble deposition on the flow field in the pipeline,and provide optimization guidance for the solution of the delayed drainage problem in field construction.The results showed that the problem of slagging stagnation was due to the low drag force provided by the low flow rate slurry,and a large number of particles were deposited at the bend of the pipeline.The larger the curved pipe was,the later the critical pointed at which the particle formation velocity and slagging velocity reached the dynamic equilibrium,indicating that the more the number of deposit particles.Particle deposition made the effective flow area smaller,the slurry flow rate was obviously stratified,and the stratification of flow field was more unfavorable to the migration of sediment particles at the bottom,which aggravated the problem of hysteresis.The larger the viscosity of the slurry,the greater the drag force of the particles between slurry,and the larger the average migration velocity of the particles.Slurry density had little effect on the horizontal movement of particles,but when particles were transported upward,slurry density could provide higher buoyancy,which was conducive to preventing the stagnation of particles.

关 键 词：泥水盾构 滞排 CFD-DEM 卵石运移 

分 类 号：TU94[建筑科学—建筑技术科学]