单轴压缩垃圾液污染黄土电阻率特征试验研究

刘华; 冯洪峰; 王宝; 孟令俭; 胡文乐

doi:10.20174/j.JUSE.2024.04.10

地下空间与工程学报 >

2024 , Vol. 20 >Issue 4: 1152 - 1159

DOI: https://doi.org/10.20174/j.JUSE.2024.04.10

理论与试验研究

单轴压缩垃圾液污染黄土电阻率特征试验研究

刘华 ,
冯洪峰 ,
王宝 ,
孟令俭 ,
胡文乐

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1.西安建筑科技大学土木工程学院, 西安 710055;
2.陕西省岩土与地下空间工程重点实验室, 西安 710055;
3.西安建筑科技大学环境与市政工程学院, 西安 710055

刘华(1983—),男,陕西延安人,博士,副教授、硕士生导师,主要从事黄土力学与工程方面的教学和研究工作。E-mail:liuhua029@xauat.edu.cn

收稿日期: 2023-10-28

网络出版日期: 2024-09-04

基金资助

国家自然科学基金(51608436,52278370);陕西省自然科学基金(2022JM246)

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Experiment Study on Resistivity Characteristics of Landfill Leachate Contaminated Loess in Uniaxial Compression Process

Liu Hua ,
Feng Hongfeng ,
Wang Bao ,
Meng Lingjian ,
Hu Wenle

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1. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China;
2. Key Laboratory of Geotechnical and Underground Space Engineering of Shaanxi Province, Xi'an 710055, P.R. China;
3. School of Environmental & Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China

Received date: 2023-10-28

Online published: 2024-09-04

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摘要

为研究不同含水率、垃圾渗滤液浓度的原状污染黄土电阻率与压缩特征之间的关联,人工配置垃圾渗滤液对黄土进行预污染,制备了不同含水率、不同污染液浓度侵扰的黄土试样,并基于Fukue提出的固结仪–电阻率试验原理进行室内试验,分析了不同含水率和渗滤液浓度对电阻率的影响,进一步探讨了各含水率下不同污染试样压缩系数与电阻率特征值之间的定量关系。结果表明:污染液侵入后会导致土体电阻率急剧降低,不同污染浓度试样间电阻率的差值较小;低含水率时电阻率对水分的响应度更高,随含水率升高,响应度开始降低;在0~100 kPa应力下,电阻率出现骤降,当应力增加至100 kPa后,电阻率逐渐稳定;以垃圾渗滤液含水状态为中间变量,进一步拟合了压缩系数与电阻率特征值之间的关系,其呈现出指数递减趋势;最后提出不同孔隙水化学溶液下的利用电阻率特征值评价黄土受垃圾渗滤液污染程度影响的工程分级评价建议。

关键词： 垃圾渗滤液; 原状黄土; 压缩试验; 电阻率特征; 工程评价指标

本文引用格式

刘华 , 冯洪峰 , 王宝 , 孟令俭 , 胡文乐 . 单轴压缩垃圾液污染黄土电阻率特征试验研究[J]. 地下空间与工程学报, 2024 , 20(4) : 1152 -1159 . DOI: 10.20174/j.JUSE.2024.04.10

Abstract

In order to investigate the relationship between the resistivity and compression coefficient of contaminated loess at different water contents and landfill leachate concentrations, the loess samples were pre-contaminated by artificially leachate. Then laboratory tests were carried on based on the consolidation-resistivity test principle which proposed by Fukue, and the effects of water contents and leachate concentrations on resistivity were analyzed. The quantitative relationship between the compression coefficients and resistivity characteristic values at different pore water state was also analyzed. The results showed that The intrusion of contaminated liquid will lead to a sharp decrease in soil resistivity, and the difference in resistivity between specimens with different contamination concentrations is small; the resistivity response to moisture is higher at low water content, and begins to decrease as the water content increases, Sudden drop in resistivity at 0 to 100 kPa; when the stress increases to 100 kPa, the resistivity gradually stabilizes; the relationship between the compression coefficient and the characteristic value of resistivity is further fitted using the water content state of the waste leachate as an intermediate variable, and it shows an exponentially decreasing trend. Then, an engineering classification suggestion of resistivity characteristic value was proposed to evaluate the effect of contamination loess by landfill leachate.

Key words： landfill leachate; undisturbed loess; compression tests; resistivity characteristics; engineering evaluation index

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