生活垃圾渗滤液污染砂土电阻率变化机制实验研究  

Investigation on electrical resistivity of soils by contaminated domestic landfill-leachate

作　　者：马媛媛[1] 郭秀军[1] 朱大伟[1] 张艳[1] 吴清[1] 石晓然[1] 

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266003

出　　处：《地球物理学进展》2010年第3期1098-1104,共7页Progress in Geophysics

基　　金：国家自然科学基金(40706020)资助

摘　　要：为探讨含水多孔介质被垃圾渗滤液污染后的电阻率模型,实现基于土体电阻率的污染物量化分析,以不同粒径组成、不同初始含水量三种渗滤液污染砂土为样本进行了电阻率测试,基于实验结果对污染砂土电阻率变化机制进行了分析.结果显示污染砂土电阻率普遍随渗滤液侵入量增大呈指数降低;和相同含水程度未污染土相比,污染土电阻率值更低,降低幅度随初始含水量增大而减小.渗滤液污染导致的孔液电阻率变小、孔隙水含量增大是导电性增强的主导因素,与此同时污染过程也存在导致土体导电性降低的因素,降低因子受土的类型和初始含水量控制.涵盖这些因素的Archie型公式可作为渗滤液污染土的电性基本式,进而可利用这个基本式实现土体中污染物含量的量化分析.The relationship formula between electrical resistivity of soil contaminated by landfill leachate and constituent concentrations in it has not been established in the past studies. To make the electrical resistivity model of contaminated soil clear, the resistivity of some leachate-polluted soil samples has been tested in laboratory. Tested soil samples are made of different particle sizes, compositions and water contents. According to test results, electrical mechanism of contaminated soil is studied. Experimental results show that resistivity of contaminated soil decreases with increasing leachate content. Comparing with uncontaminated soil of the same water content, resistivity of leachate contaminated soil decreases obviously. It is due to the resistivity of pore fluid decreasing and the pore water content increasing after soils being contaminated by leaehate. Meanwhile, the pollution process also makes the resistivity of contaminated soil increase, and the increasing range is related with the kind of soil and initial water content. All these factors have been taken into the Archie type formula of the leachate-contaminated soil. It＇s important to hold indicators of soil physical properties in analysis of the contamination content from the tested electrical resistivity of the contaminated soil.

关 键 词：垃圾渗滤液 土壤污染 电性特征 量化分析 

分 类 号：P631[天文地球—地质矿产勘探]