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Effects of occurrence form of soil organic matter on the Atterberg limits and thermal conductivity of clays

Published online by Cambridge University Press:  10 September 2024

Yue Gui Open the ORCID record for Yue Gui [Opens in a new window] ,
Qingkun Sang  and
Jie Yin Open the ORCID record for Jie Yin [Opens in a new window]
Yue Gui
Affiliation:
Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, China
Qingkun Sang
Affiliation:
Faculty of Tourism Management, Three Gorges Tourism Polytechnic College, Yichang, China
Jie Yin*
Affiliation:
Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, China
*
Corresponding author: Jie Yin; Email: yinjie@ujs.edu.cn
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Abstract

Because of the interfacial interactions between mineral soil particles and soil organic matter (SOM), SOM occurs in various forms in the soil, and the mineral-associated and particulate forms are fundamental. Many recent studies have concentrated on the effects of SOM content and type on the geotechnical behavior of soil. However, the influence of SOM occurrence forms is not well understood, nor is there a scientific classification standard for SOM in geotechnical engineering. The main objectives of this study were to explore the effects of SOM occurrence forms on a few physical properties of clays to develop an engineering classification standard of SOM. First, this paper reviews the interfacial interaction mechanism, factors that influence the relation between mineral soil particles and SOM, and the classification method of SOM in soil science. Three predominant clays (montmorillonite, illite, and kaolinite) were then used as the matrix, and three groups of artificial soil samples with different SOM contents (wu ranging from 0 to 50% by weight) were prepared by adding peat. A chemical extraction method was used to determine the amount of different forms of SOM. Moreover, the Atterberg limits wL (wp) and thermal conductivity λ of artificial soil samples were tested. Based on the experimental results, the relationship between the form of SOM and these physical parameters was established. The experimental results show that the wL (wp) vs wu, and λ vs wu fitted curves were not monotonic but piecewise linear and could be divided into two straight lines with different slopes; wu corresponded to the inflection point of wL (wp) vs wu, and λ vs wu curves were closer to the threshold value wu,2. Finally, a simple engineering classification method of SOM is proposed.

Keywords

AdsorptionAtterberg limitsClaysEngineering classification standard of SOMOccurrence form of SOMThermal conductivity
Type
Original Paper
Information
Clays and Clay Minerals , Volume 72 , 2024 , e10
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Clay Minerals Society

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