岩土工程学报2015，Vol.37Issue(10)：1786-1793,8.DOI:10.11779/CJGE201510006
渗透作用下多孔介质中悬浮颗粒的迁移过程研究
Transport processes of suspended particles in saturated porous mediaby column seepage tests
摘要
Abstract
The penetration processes of a typical silica powder in saturated porous media composed of quartz sands are studied by column seepage tests. The tests consider 6 kinds of particle sizes (i.e., 10, 15, 20, 25, 33, 47μm), 3 particle concentrations (i.e., 0.2, 0.5, 0.8 mg/mL), 3 flow velocities (i.e., 0.087, 0.173, 0.260 cm/s), and different flow directions (i.e., downward, horizontal, upward), etc. According to the test results, the physical mechanisms of suspended particle migration such as hydrodynamics, dispersion and deposition are discussed. The studies show that for the same seepage velocity, the peak concentrations of penetration process decrease generally with the increase of particles size. On the other hand, the effect of hydrodynamic processes on particle transport is increased obviously with the increase of flow velocity while the effect of particle size is degenerated correspondingly. Besides, there exists a critical injected concentration, and beyond this value the relative concentration in the effluent begins to decrease, which is related to the logging of pores of porous media due to a large number of deposited particles.关键词
多孔介质/悬浮颗粒/渗透试验/迁移过程/相对浓度Key words
porous media/suspended particle/seepage test/transport process/relative concentration分类
建筑与水利引用本文复制引用
白冰,张鹏远,宋晓明,郭志光,陈星欣..渗透作用下多孔介质中悬浮颗粒的迁移过程研究[J].岩土工程学报,2015,37(10):1786-1793,8.基金项目
国家自然科学基金项目(51279002,51478034) （51279002,51478034）
高等学校博士学科点专项科研基金博导类资助项目(20130009110021) （20130009110021）
