[1]张学羿,窦智.黏土微观孔隙结构对可溶性污染物运移的影响[J].水文地质工程地质,2018,45(04):157.[doi:10.16030/j.cnki.issn.1000-3665.2018.04.23]
 ZHANG Xueyi,DOU Zhi.Influence of microscopic pore structure of clay on soluble contaminant transport[J].Hydrogeology & Engineering Geology,2018,45(04):157.[doi:10.16030/j.cnki.issn.1000-3665.2018.04.23]
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黏土微观孔隙结构对可溶性污染物运移的影响()
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《水文地质工程地质》[ISSN:1000-3665/CN:11-2202/P]

卷:
45卷
期数:
2018年04期
页码:
157
栏目:
环 境 地 质
出版日期:
2018-07-15

文章信息/Info

Title:
Influence of microscopic pore structure of clay on soluble contaminant transport
文章编号:
1000-3665(2018)03-0157-08
作者:
张学羿 窦智
河海大学地球科学与工程学院, 江苏 南京210098
Author(s):
ZHANG Xueyi DOU Zhi
School of Earth Sciences and Engineering, Hohai University, Nanjing, Jiangsu210098, China
关键词:
可溶性污染物污染物运移穿透曲线地下水
Keywords:
solube contaminant contaminant transport breakthrough curve groundwater
分类号:
X523
DOI:
10.16030/j.cnki.issn.1000-3665.2018.04.23
文献标志码:
A
摘要:
多孔介质的微观结构对可溶性污染物的运移具有重要影响。文章利用随机生长四参数生成法(Quartet Structure Generation Set, QSGS),构造具有各向异性孔隙结构的黏土多孔介质,且其固相颗粒具有随机性的粗糙表面。通过Stokes方程与对流扩散方程(ADE)耦合计算得到微观孔隙结构的非均匀水流场与浓度场。对黏土微观结构的非均匀水流场和浓度场进行分析,研究不同截面位置上水流分布情况,在脉冲注入的条件下讨论黏土微观结构对于可溶性污染物运移的影响。结果表明:具有随机性的黏土微观孔隙结构是导致水流场水流速度分布不均匀的主要因素;黏土中微小空隙或死端孔隙往往容易残留高浓度污染物,造成污染穿透曲线的“托尾”现象,也是污染后期的主要污染残留位置。
Abstract:
The microstructure of porous media has important effect on the transport of soluble contaminants. In this paper, we use the Quartet Structure Generation Set (QSGS) to construct clay porous media with an anisotropic pore structure, and its solid particles have random rough surface. The nonuniform flow field and the concentration field in the microporous structure are calculated by coupling Stokes Equation and Advection-Diffusion Equation (ADE). We analyze the nonuniform flow field and concentration field and study the water velocity distribution at different cross-sections and explored the effect of clay’s microscopic pore structure on soluble contaminant transport under the condition of the pulse injection. The results show that randomscattered pore structure is the main factor that leads to the nonuniform distribution of water velocity in flow field. Small-scale pore or dead-end pore in the clay could easily trap contaminants with high concentration, causing a ‘tail’ phenomenon on the breakthrough curve. Furthermore, the residual contaminant at the late time is captured in these small-scale or dead-end pores.

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备注/Memo

备注/Memo:
收稿日期: 2017-07-06; 修订日期: 2017-10-11
基金项目: 国家自然科学基金项目(41602239);江苏省自然科学基金项目(BK20160861)
第一作者: 张学羿(1996-),男,本科,地质工程专业。E-mail:zxyi@hhu.edu.cn
通讯作者: 窦智(1986-),男,副教授,主要从事污染水文地质及其污染界面控制研究。E-mail:douz@hhu.edu.cn
更新日期/Last Update: 2018-07-15