渗透作用下多孔介质中颗粒迁移特性试验研究

发布时间：2018-05-03 03:21

本文选题：多孔介质 + 颗粒　；参考：《北京交通大学》2014年硕士论文

【摘要】：摘要：多孔介质中颗粒迁移特性的研究在地下水回灌、石油开采、核废料处置、地下污染物扩散、注浆加固和水工结构的内部侵蚀破坏等方面有很重要的研究意义,是当今环境岩土工程领域的一个重要研究方向。基于以上所述背景,本文结合已有的饱和多孔介质中颗粒迁移问题的研究现状,利用自行研制的试验装置,对饱和多孔介质中颗粒迁移特性进行试验研究,主要研究内容包括试验研究和机理分析两方面。首先,通过试验计算得出水中颗粒浓度和浊度的关系,摒弃以往研究中经常采用的过程复杂、效率低下的过滤称重法,改为采用通过浊度测定颗粒浓度的方法；其次,开展不同的颗粒粒径、颗粒浓度、渗流速度、渗流方向等情况下颗粒迁移的室内土柱系列试验,得出饱和多孔介质中悬浮颗粒在6种不同颗粒粒径(D50=10μm,15μm,20μm,25μm,33μm,47μm)、3种不同颗粒浓度(0.2mg/ml,0.5mg/ml,0.8mg/ml)、3种不同渗流速度(0.087cm/s,0.173cm/s,0.260cm/s)、3种不同渗流方向(自上向下,水平,自下向上)等条件下的颗粒穿透曲线；最后,通过对试验结果进行综合的对比和深入的分析,探究颗粒粒径、颗粒浓度、渗流速度、渗流方向等物理因素对于饱和多孔介质中颗粒迁移特性的影响。由试验结果分析可知,颗粒粒径、颗粒浓度、渗流速度、渗流方向等物理因素均会对饱和多孔介质中颗粒迁移特性产生很大影响；同时各种物理因素又是一个有机的整体因素,是相互联系、相辅相成的,某一种物理因素的改变在影响着颗粒迁移的同时,也会促使其他物理因素对颗粒迁移特性的影响发生改变。
[Abstract]:Abstract: the study of particle migration characteristics in porous media is of great significance in groundwater recharge, petroleum exploitation, nuclear waste disposal, underground pollutant diffusion, grouting reinforcement and internal erosion and destruction of hydraulic structures. It is an important research direction in the field of environmental geotechnical engineering. Based on the above mentioned background, combining with the existing research status of particle migration in saturated porous media, the characteristics of particle migration in saturated porous media are studied by using a self-developed experimental device. The main research contents include experimental research and mechanism analysis. First, the relationship between particle concentration and turbidity in water is obtained by experimental calculation. The filtration weighing method, which is often used in previous studies, is replaced by the method of measuring particle concentration through turbidity. Laboratory soil column series tests with different particle size, particle concentration, percolation velocity, seepage direction and so on were carried out. The results show that the suspended particles in saturated porous media have three different percolation velocities of 0.087 cms0.173 cms0.176 cms0.260 cms-1 / 3 different percolation directions (from top down, level, from bottom up) to three different percolation directions (from top down, level up, from bottom up) to three different percolation directions (from top down, level, from bottom up) to three different percolation speed of suspended particles in saturated porous media. Through the comprehensive comparison and in-depth analysis of the experimental results, the effects of particle size, particle concentration, seepage velocity and seepage direction on the particle migration characteristics in saturated porous media are explored. The experimental results show that the particle size, particle concentration, percolation velocity, seepage direction and other physical factors have great influence on the particle migration in saturated porous media, and all kinds of physical factors are an organic whole factor. The change of one kind of physical factors not only affects particle migration, but also impels other physical factors to change the particle migration characteristics.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU43;TU411

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