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

Zhu Fanghua, Zhang Zhifeng, Tao Wenbin, Li Fanfan and Wei Tianyu
Changes in geotechnical properties of soil contaminated by methyl tertiary butyl ether (MTBE)
Quarterly Journal of Engineering Geology and Hydrogeology (March 2023) 56 (2)

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.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 56
Serial Issue: 2
Title: Changes in geotechnical properties of soil contaminated by methyl tertiary butyl ether (MTBE)
Affiliation: Anhui Transport Consulting & Design Institute, Hefei, China
Pages: Unpaginated
Published: 20230306
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 61
Accession Number: 2023-028701
Categories: Environmental geologyEngineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N23°40'00" - N28°19'60", E115°40'00" - E120°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 202319
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