悬浮颗粒的浓度对其在饱和多孔介质中迁移和沉积特性的影响  

Influence of concentration of suspended particles on transport and deposition characteristics in saturated porous media

作　　者：陈星欣[1] 白冰[1] 闫瑜龙[1] 贾丁云[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2012年第8期2343-2348,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50978022);中央高校基本科研业务费专项资金资助项目(No.2011YJS047)

摘　　要：多孔介质中悬浮颗粒迁移和沉积特性的研究对地下污染物净化、石油开采、核废料处置、水土保持等有很重要的意义。对4种不同浓度的悬浮颗粒在3种不同的渗流速度下进行室内试验,研究悬浮颗粒的浓度对其迁移和沉积特性的影响。结果表明,在一定的悬浮颗粒浓度下,随着渗流速度的增加,穿透曲线中的悬浮颗粒的相对浓度也增大。同时,渗流速度一定时,悬浮颗粒的浓度存在一个临界值,小于该临界值,穿透曲线中的相对浓度随悬浮颗粒的浓度增大而增大;大于该临界值时,相对浓度随悬浮颗粒的浓度增大而减小。另外,悬浮颗粒的临界浓度是与渗流速度相关的,随着渗流速度增加,悬浮颗粒的临界浓度也逐渐增大。Suspended particles transport and deposition in porous media play an important role in pollutant purification, oil exploration, nuclear waste disposal, water- soil conservation. In order to study the effect of suspended particles concentration on the breakthrough curves, 4 different suspended particle concentrations have been studied under 3 flow velocities in columns of saturated porous media. The studies show that, under constant suspended particle concentration, the relative concentration is increase with the flow velocity. Meanwhile, under a constant flow velocity, there exists a critical concentration for suspended particles. Below the critical concentration, relative concentration in breakthrough curves is in creased with the suspended particles concentration; but the trend is inversely when the suspended particle concentration is more than the critical value. Besides, the critical concentration of suspended particles is related to the flow velocity; the critical value is increased with the flow velocity.

关 键 词：悬浮颗粒 浓度 饱和多孔介质 迁移 沉积 

分 类 号：TU441[建筑科学—岩土工程]