Cargando…
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...
Autores principales: | , , , , , , |
---|---|
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 |
_version_ | 1783644037883887616 |
---|---|
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. |
format | Online Article Text |
id | pubmed-7842921 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT zhoucuiying studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT cuiguangjun studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT yinhao studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT yulei studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT xugankai studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT liuzhen studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives AT zhanglihai studyofsoilexpansioncharacteristicsinrainfallinducedredbedshallowlandslidesmicroscopicandmacroscopicperspectives |