基于竖管法的轻非水相液体毛细上升特性研究  

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

作　　者：李志萍 刘宇 赵贵章 周汇 刘少康 刘文辉 LI Zhiping;LIU Yu;ZHAO Guizhang;ZHOU Hui;LIU Shaokang;LIU Wenhui(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou,Henan 450045,China;Henan Quality Institute,Pingdingshan,Henan 467000,China)

机构地区：[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

出　　处：《水文地质工程地质》2023年第4期105-114,共10页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(41372260,41972261);第十四届研究生创新能力提升工程项目(NCWUYC-2023038)。

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在土壤中的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:影响毛细上升高度的因素大小依次为: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。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.

关 键 词：轻非水相液体 竖管直径 毛细上升高度 毛细上升速率 

分 类 号：P641.2[天文地球—地质矿产勘探]