The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

Abstract This paper investigates the effect of particle shape on the stress reduction and collapse deformation of gravelly soil using a medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. A new method based on the Micro-Deval test was...

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Autores principales:	Reza Mahinroosta, Vahid Oshtaghi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/401454b677cd422a840afddb31ad6018
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spelling	oai:doaj.org-article:401454b677cd422a840afddb31ad60182021-12-02T15:10:46ZThe effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting10.1038/s41598-021-95731-y2045-2322https://doaj.org/article/401454b677cd422a840afddb31ad60182021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95731-yhttps://doaj.org/toc/2045-2322Abstract This paper investigates the effect of particle shape on the stress reduction and collapse deformation of gravelly soil using a medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. A new method based on the Micro-Deval test was introduced to produce sub-angular particles from angular particles. Therefore, two series of soil specimens were obtained with the same rock origin, particle size distribution, and relative density but different particle shapes. In addition to traditional direct shear tests on dry and wet specimens, a specific test procedure was applied to explore the stress reduction and collapse of soil specimens due to wetting. The results of the tests, including shear stress–shear displacement and vertical displacement-shear displacement, were compared. The results showed that the stress reduction and settlement due to wetting increased with vertical and shear stress levels in both types of particle shapes, with higher values in angular particle shapes. The particle breakage of the soil specimens was also studied quantitatively using the change in the particle size distribution before and after the test. It was shown that the wetting of the samples had more impact on the particle breakage in angular gravel than sub-angular gravel, which increased linearly with the normal stress.Reza MahinroostaVahid OshtaghiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Reza Mahinroosta Vahid Oshtaghi The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
description	Abstract This paper investigates the effect of particle shape on the stress reduction and collapse deformation of gravelly soil using a medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. A new method based on the Micro-Deval test was introduced to produce sub-angular particles from angular particles. Therefore, two series of soil specimens were obtained with the same rock origin, particle size distribution, and relative density but different particle shapes. In addition to traditional direct shear tests on dry and wet specimens, a specific test procedure was applied to explore the stress reduction and collapse of soil specimens due to wetting. The results of the tests, including shear stress–shear displacement and vertical displacement-shear displacement, were compared. The results showed that the stress reduction and settlement due to wetting increased with vertical and shear stress levels in both types of particle shapes, with higher values in angular particle shapes. The particle breakage of the soil specimens was also studied quantitatively using the change in the particle size distribution before and after the test. It was shown that the wetting of the samples had more impact on the particle breakage in angular gravel than sub-angular gravel, which increased linearly with the normal stress.
format	article
author	Reza Mahinroosta Vahid Oshtaghi
author_facet	Reza Mahinroosta Vahid Oshtaghi
author_sort	Reza Mahinroosta
title	The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
title_short	The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
title_full	The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
title_fullStr	The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
title_full_unstemmed	The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
title_sort	effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/401454b677cd422a840afddb31ad6018
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The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

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