超声辅助复合淋洗对污染黏土的工程性质影响
摘要:研究采用超声辅助复合淋洗剂（酒石酸、乙二胺四乙酸二钠（Na2EDTA）），对人工配制的Cu2+、Ni2+、Pb2+重金属污染黏土开展试验，分析了在不同重金属离子浓度下，超声辅助复合淋洗前后土体pH值、液塑限、强度特性、压缩特性等工程性质的变化规律。试验结果表明：（1）超声淋洗修复后，污染黏土pH值显著降低，酸性淋洗剂会带来较严重的土壤酸化；（2）修复后土体液性指数增加，塑性指数降低；（3）超声淋洗修复后，土体抗剪强度降低，内摩擦角整体降低2°~3°；（4）孔隙比随固结压力增大而减小，重金属浓度越大，降低幅度越大；（5）修复后土体的压缩性增大，压缩系数增加，压缩模量降低。
Abstract:The ultrasonic-assisted complex leaching agents (tartaric acid and ethylenediaminetetraacetic acid disodium salt (Na2EDTA)) were employed to carry out experiments on contaminated clay containing heavy metals Cu2+, Ni2+, and Pb2+. The variation laws of engineering properties such as soil pH, liquid plastic limit, strength characteristics, and compression characteristics before and after ultrasonic-assisted complex leaching were scrutinized under different heavy metal ion concentrations. The results revealed: (1) Post ultrasonic-assisted complex leaching remediation, the pH value of the contaminated clay reduces significantly, with the acidic leaching agent inducing severe soil acidification. (2) Upon remediation, the soil's liquidity index increases while the plasticity index decreases. (3) After ultrasonic leaching remediation, the shear strength of the soil body reduces, with the overall internal friction angle decreasing by 2°~3°. (4) The porosity ratio decreases as consolidation pressure increases, with the reduction being more substantial the higher the heavy metal concentration. (5) Post-remediation, the compressibility of the soil body increases, as does the compression coefficient, while the modulus of compressibility diminishes.
中文标题：
超声辅助复合淋洗对污染黏土的工程性质影响
Impact of Ultrasound-assisted Complex Leaching on Engineering Properties of Contaminated Clay
作者：
邵俐,倪逸斐,王帅,邬昉瑾,迟琳
Shao Li,Ni Yifei,Wang Shuai,Wu Fangjin,Chi Lin
作者简介:邵 俐，女，1969年生，汉族，浙江吴兴人，副教授，主要从事环境岩土工程、软土地基处理研究工作。E-mail：shaoli1999@usst.edu.cn
通讯地址：
上海理工大学环境与建筑学院，上海 200093
SchoolofEnvironmentandArchitecture,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China
中图分类号:TU41
doi:10.3969/j.issn.1007-2993.2024.03.015
出版物：岩土工程技术
收稿日期:2023-08-13
修回日期:2023-12-19
录用日期:2023-12-25
刊出日期:2024-06-12
关键词:超声辅助,复合淋洗,污染黏土,工程性质
Key words:ultrasonic-assisted,complex leaching,contaminated clay,engineering property
文档包含图片数量：图片(10)张
文档包含表格数量：表格(2)个
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基金项目：
基金项目:上海市科委扬帆计划（YF1431800）
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