摘要
岩土多孔介质中发生的渗透淤堵本质上是渗流与颗粒耦合作用的结果。开发了适用于岩土渗流-颗粒耦合模拟的格子Boltzmann方法-浸入运动边界-离散元法(LBM-IMB-DEM)数值计算平台并对岩土多孔介质的渗透淤堵过程开展了孔隙尺度的模拟,分析了多孔介质骨架颗粒分布、骨架颗粒粒径、孔隙率、骨架颗粒定向性及水压力等因素对其渗透淤堵特性的影响。结果表明:多孔介质中骨架颗粒的空间分布不同,其渗透淤堵特性也有所区别;多孔介质的骨架颗粒粒径或孔隙率越小,淤堵后的滞留颗粒越多,淤堵越严重;骨架颗粒定向性对淤堵特性有一定影响,当骨架颗粒为条形且其长轴与流动方向垂直时淤堵最为严重;随水压力增大,淤堵后滞留颗粒在多孔介质中的分布更趋于分散,淤堵更为严重;岩土多孔介质渗透淤堵的程度与其淤堵前的渗透性密切相关,透水性强的多孔介质相对不易发生淤堵。
Seepage clogging in rock and soil porous media is essentially the result of the coupling action of seepage and solid particles. A numerical computing platform based on the coupled lattice Boltzmann method-immersed moving boundary-discrete element method(LBM-IMB-DEM) is developed and used to simulate the seepage clogging process in rock and soil porous media. Based on the simulated results, the influences of distribution of skeleton particles, size of skeleton particles, porosity, orientation of skeleton particles and water pressure on the seepage clogging characteristics are analyzed. The results show that different spatial distributions of skeleton particles in the porous media result in different clogging characteristics. The smaller the skeleton particle size or the porosity of porous media is, the more the retained particles are after clogging and the more severe the clogging is. The orientation of skeleton particles in the porous media has a certain influence on clogging, and the clogging is the worst when the skeleton particles are strip-shaped and their long axes are all perpendicular to the flow direction. With the increase of water pressure, the retained particles tend to disperse in the porous media and the clogging is more serious. The clogging in the porous media is closely related to their permeability before clogging, and the porous media with high permeability are relatively less prone to clogging.
作者
金磊
曾亚武
程涛
李晶晶
JIN Lei;ZENG Ya-wu;CHENG Tao;LI Jing-jing(School of Civil Engineering and Architecture,Hubei Polytechnic University,Huangshi 435003,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第5期909-917,I0006,F0003,共11页
Chinese Journal of Geotechnical Engineering
基金
湖北省自然科学基金项目(2019CFB199)
国家自然科学基金项目(41272342,12002121)
湖北省高等学校优秀中青年科技创新团队计划项目(T201823)。
作者简介
金磊(1989—),男,博士,副教授,主要从事岩土流-固耦合数值模拟等方面的研究工作。E-mail:whujinlei@whu.edu.cn。
