Changes in geotechnical properties of soil contaminated by methyl tertiary butyl ether (MTBE)

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-03-06 DOI:10.1144/qjegh2022-095
Fanghua Zhu, Zhifeng Zhang, W. Tao, Fanfan Li, Tianyu Wei
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Abstract

As one of the extensively used gasoline additives, MTBE can leak into the subsurface, which will not only deteriorate the ecological environment, but also affect the geotechnical characteristics of the soil. In this study, the geotechnical properties of MTBE-contaminated soil consisting of the basic physical properties, strength, compressibility, hydraulic conductivity, leachability, electrical resistivity and microstructural characteristics are comprehensively investigated. The results show that the Atterberg limits consistently decrease with increasing MTBE content in the soil. As the MTBE content increases from 0% to 10%, the specific surface area of the soil decreases by 28%, the sand content increases by 22%, the clay and silt contents decreases by 3% and 18%, respectively. The soil compression index, hydraulic conductivity, leached MTBE concentration and electrical resistivity increase, while the UCS decreases with increasing the MTBE content. Microstructural analysis shows that increasing MTBE content would result in mineralogical alterations that decrease the illite and kaolinite content in the soil. The aggregation and flocculated structures could be detected with an increase in the number and size of the inter-aggregate pores. Additionally, electrical resistivity of the contaminated soil is adopted to assess the geotechnical properties of MTBE-contaminated soil based on the well-established empirical relations.
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甲基叔丁基醚(MTBE)污染土壤岩土力学性质的变化
MTBE作为广泛使用的汽油添加剂之一,会渗入地下,不仅会恶化生态环境,还会影响土壤的岩土特性。本研究全面研究了mtbe污染土壤的岩土力学性质,包括基本物理性质、强度、压缩性、导电性、浸出性、电阻率和微观结构特征。结果表明,随着MTBE含量的增加,Atterberg极限持续降低。随着MTBE含量从0%增加到10%,土壤比表面积减少28%,砂土含量增加22%,粘土和粉土含量分别减少3%和18%。随着MTBE含量的增加,土壤压缩指数、水力导电性、浸出MTBE浓度和电阻率增加,而UCS减小。微观结构分析表明,增加MTBE含量会导致矿物学变化,降低土壤中伊利石和高岭石的含量。随着聚团间孔隙数量和大小的增加,可以检测到聚集和絮凝结构。此外,基于已建立的经验关系,采用污染土的电阻率对mtbe污染土的岩土力学性质进行评价。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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