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Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives

The main cause of rainfall-induced red-bed shallow landslides is the tendency of red-bed weathered soil to expand when it meets water. However, studies on the expansion mechanism of expansive soil have not considered the effects of hydration and particle orientation. In this study, the hydration for...

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Autores principales: Zhou, Cuiying, Cui, Guangjun, Yin, Hao, Yu, Lei, Xu, Gankai, Liu, Zhen, Zhang, Lihai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842921/
https://www.ncbi.nlm.nih.gov/pubmed/33508022
http://dx.doi.org/10.1371/journal.pone.0246214
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author Zhou, Cuiying
Cui, Guangjun
Yin, Hao
Yu, Lei
Xu, Gankai
Liu, Zhen
Zhang, Lihai
author_facet Zhou, Cuiying
Cui, Guangjun
Yin, Hao
Yu, Lei
Xu, Gankai
Liu, Zhen
Zhang, Lihai
author_sort Zhou, Cuiying
collection PubMed
description The main cause of rainfall-induced red-bed shallow landslides is the tendency of red-bed weathered soil to expand when it meets water. However, studies on the expansion mechanism of expansive soil have not considered the effects of hydration and particle orientation. In this study, the hydration force of soil was determined according to the electric double-layer theory, the particle direction of soil was determined by analyzing images of soil obtained by scanning electron microscopy, and, finally, a microscopic model of the electrical double layer of red-bed weathered expansive soil was established in which the hydration force and soil-particle orientation were taken into account. The results showed that the expansion of red-bed weathered expansive soil is the result of hydration forces and repulsive forces in the electric double layer. The grain orientation of the soil strongly influenced the microscopic model. The unloading expansion rate of red-bed weathered expansive soil decreased with an increase in cation concentration and a decrease in pH value. It increased with an increase in the hydration cation radius. These experiments indicate the reliability of the microscopic model and provide a theoretical basis for the prevention and control of rainfall-induced red-bed shallow landslides.
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spelling pubmed-78429212021-02-04 Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives Zhou, Cuiying Cui, Guangjun Yin, Hao Yu, Lei Xu, Gankai Liu, Zhen Zhang, Lihai PLoS One Research Article The main cause of rainfall-induced red-bed shallow landslides is the tendency of red-bed weathered soil to expand when it meets water. However, studies on the expansion mechanism of expansive soil have not considered the effects of hydration and particle orientation. In this study, the hydration force of soil was determined according to the electric double-layer theory, the particle direction of soil was determined by analyzing images of soil obtained by scanning electron microscopy, and, finally, a microscopic model of the electrical double layer of red-bed weathered expansive soil was established in which the hydration force and soil-particle orientation were taken into account. The results showed that the expansion of red-bed weathered expansive soil is the result of hydration forces and repulsive forces in the electric double layer. The grain orientation of the soil strongly influenced the microscopic model. The unloading expansion rate of red-bed weathered expansive soil decreased with an increase in cation concentration and a decrease in pH value. It increased with an increase in the hydration cation radius. These experiments indicate the reliability of the microscopic model and provide a theoretical basis for the prevention and control of rainfall-induced red-bed shallow landslides. Public Library of Science 2021-01-28 /pmc/articles/PMC7842921/ /pubmed/33508022 http://dx.doi.org/10.1371/journal.pone.0246214 Text en © 2021 Zhou et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Zhou, Cuiying
Cui, Guangjun
Yin, Hao
Yu, Lei
Xu, Gankai
Liu, Zhen
Zhang, Lihai
Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title_full Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title_fullStr Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title_full_unstemmed Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title_short Study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: Microscopic and macroscopic perspectives
title_sort study of soil expansion characteristics in rainfall-induced red-bed shallow landslides: microscopic and macroscopic perspectives
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7842921/
https://www.ncbi.nlm.nih.gov/pubmed/33508022
http://dx.doi.org/10.1371/journal.pone.0246214
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