基于竖管法的轻非水相液体毛细上升特性研究

李志萍; 刘宇; 赵贵章; 周汇; 刘少康; 刘文辉

doi:10.16030/j.cnki.issn.1000-3665.202209020

基于竖管法的轻非水相液体毛细上升特性研究

doi: 10.16030/j.cnki.issn.1000-3665.202209020

李志萍^{1, 2,},
刘宇¹,
赵贵章^1, ,,
周汇¹,
刘少康¹,
刘文辉¹

1.
华北水利水电大学地球科学与工程学院，河南郑州　450045
2.
河南质量工程职业学院，河南平顶山　467000

基金项目: 国家自然科学基金项目(41372260；41972261)

详细信息

作者简介:
李志萍（1971—），女，博士，教授，主要从事地下水污染控制与环境影响评价等方面工作。E-mail：lizhiping@ncwu.edu.cn

通讯作者:
赵贵章（1975—），男，博士，副教授，主要从事水文地质与环境地质等方面工作。E-mail：guizhangzhao@163.com

中图分类号: P641.2
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出版历程
- 收稿日期: 2022-09-14
- 修回日期: 2022-12-25

A study of the capillary rise characteristics of LNAPL based on the vertical pipes method

LI Zhiping^{1, 2
,},
LIU Yu¹,
ZHAO Guizhang^{1
, ,},
ZHOU Hui¹,
LIU Shaokang¹,
LIU Wenhui¹

1.
North China University of Water Resources and Electric Power, Zhengzhou, Henan　450045, China
2.
Henan Quality Institute, Pingdingshan, Henan　467000, China

摘要

摘要: 被称为“工业血液”的轻非水相液体(LNAPL)及其衍生物在开采、生产、运输过程中所产生的污染已经成为常见的污染物，目前诸多学者对LNAPL污染进行了广泛研究，但对于LNAPL在土壤中迁移及毛细作用研究尚不充分。本次试验的目的是通过室内模拟试验分析不同竖管直径条件下LNAPL在不同介质中的毛细上升规律，为研究LNAPL对地下水污染提供一定的理论依据。结果表明：影响毛细上升高度因素大小依次为：溶液>介质>竖管直径；竖管直径与最大毛细上升高度并不是完全成比例关系，并且对毛细上升高度的影响相对较小；水与柴油在不同介质中毛细上升高度、毛细上升速率变化趋势基本一致，但是具体数值上存在差异，柴油的最大毛细上升高度与水相比降低了40%～50%，柴油的最大毛细上升速率与水相比降低30%～50%。这些特征都能够较好地体现LNAPL在不同介质中的毛细上升规律，在认识LNAPL对地下水的污染以及污染土地修复方面具有重要意义。
- 轻非水相液体 /
- 竖管直径 /
- 毛细上升高度 /
- 毛细上升速率
Abstract: The pollution caused by light non-aqueous phase liquid (LNAPL) and its derivatives, known as "industrial blood", in the process of mining, production and transportation, has become a common pollutant. At present, many researchers have carried out extensive researches on LNAPL pollution, but the researches on the migration and hairiness of LNAPL in soil is still insufficient. The purpose of this test is to study and analyze the capillary rise law of LNAPL in different media under different standpipe diameters through indoor simulation tests, so as to provide a certain theoretical basis for studying the groundwater pollution caused by LNAPL. The results show that the factors influencing the height of capillary rise are, in order, the solution > medium> vertical tube diameter. The diameter of the vertical tube is not completely proportional to the maximum capillary rise height, and the influence on the capillary rise height is relatively small. The capillary rise height and capillary rise rate of water and diesel in different media are basically the same, but there are differences in specific values. The maximum capillary rise height of diesel is 40%−50% lower than that of water, and the maximum capillary rise rate of diesel is 30%−50% lower than that of water. The average particle size of sand is inversely proportional to the capillary rise height and rate. These characteristics can better reflect the capillary rise law of LNAPL in different media, which are of important significance to understand the pollution of LNAPL to groundwater and the remediation of contaminated lands.
- LNAPL /
- vertical pipe diameter /
- capillary rise height /
- capillary rise rate

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图 1 试验装置示意图

Figure 1. Schematic diagram of the test device

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图 2 介质不同时毛细上升高度随竖管直径的变化

Figure 2. Changes of capillary rise height with the diameter of the vertical pipe when the medium is different

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图 3 竖管直径不同时毛细上升高度变化规律

Figure 3. Variations of capillary rise height with different diameters of the vertical tube

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图 4 竖管直径不同时毛细上升速率变化规律

Figure 4. Variations of capillary rise rate with different diameters of the vertical tube

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表 1 试验砂样颗粒级配

Table 1. Particle gradation of the experimental sand samples

试样	不均匀系数	曲率系数	平均粒径/mm	粒径所占百分比/%
试样	不均匀系数	曲率系数	平均粒径/mm	0.500～<2.0mm	0.25～<0.5mm	0.075～<0.25mm	0.005～<0.075mm	<0.005mm
细砂	1.89	0.87	0.131	−	−	94.4	3	2.6
粉砂	30.67	4.78	0.205	17.5	26.2	38.1	12.9	5.3
粗砂	5.37	1.16	0.610	58.3	24.7	15.3	1.2	0.5

下载: 导出CSV

表 2 毛细上升试验方案

Table 2. Capillary rise test schemes

试验编号	介质	竖管直径/cm	溶液	试验编号	介质	竖管直径/cm	溶液
1#	细砂	1.6	水	10#	粉砂	3.0	柴油
2#	细砂	1.6	柴油	11#	粉砂	5.0	水
3#	细砂	3.0	水	12#	粉砂	5.0	柴油
4#	细砂	3.0	柴油	13#	粗砂	1.6	水
5#	细砂	5.0	水	14#	粗砂	1.6	柴油
6#	细砂	5.0	柴油	15#	粗砂	3.0	水
7#	粉砂	1.6	水	16#	粗砂	3.0	柴油
8#	粉砂	1.6	柴油	17#	粗砂	5.0	水
9#	粉砂	3.0	水	18#	粗砂	5.0	柴油

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表 3 极差分析结果

Table 3. Range analysis results

因素	K_avg值			R	折算系数d	R′
竖管直径	36.92	39.15	38.18	2.23	0.52	2.84
介质	48.48	38.38	27.38	21.10	0.52	26.88
溶液	48.26	27.91	—	20.35	0.71	43.55

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表 4 毛细上升高度与时间关系拟合参数

Table 4. Fitting parameters of the relationship between capillary rise height and time

竖管直径/cm	系数	水			柴油
竖管直径/cm	系数	细砂	粉砂	粗砂	细砂	粉砂	粗砂
1.6	a	28.855	23.649	19.239	13.085	13.067	10.571
	b	6.672	5.919	2.863	4.570	3.726	1.939
	$ {R}^{2} $	0.996	0.990	0.985	0.996	0.995	0.977
3	a	31.446	26.440	20.339	15.143	11.408	10.181
	b	7.155	5.938	2.888	4.374	3.480	2.438
	$ {R}^{2} $	0.994	0.991	0.918	0.990	0.994	0.997
5	a	29.673	25.220	21.058	13.315	12.536	10.295
	b	6.466	6.300	3.045	3.454	3.692	2.287
	$ {R}^{2} $	0.990	0.992	0.969	0.996	0.989	0.998

下载: 导出CSV

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