Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis

The objective of this study is to quantitatively evaluate the soil structure behavior when under shear stress to understand the mechanism of shear zone formation using a micro-focus X-ray computed tomography (CT) scanner to visualize the internal samples without causing disturbance. A new image-anal...

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Autores principales:	Shintaro Nohara, Toshifumi Mukunoki
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	X-ray CT soil fabric analysis digital image correlation strain localization shear soil structure Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/dc7655f17b7e43c5b19b728afb6f7f6c
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spelling	oai:doaj.org-article:dc7655f17b7e43c5b19b728afb6f7f6c2021-11-25T18:03:27ZQuantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis10.3390/jimaging71102302313-433Xhttps://doaj.org/article/dc7655f17b7e43c5b19b728afb6f7f6c2021-10-01T00:00:00Zhttps://www.mdpi.com/2313-433X/7/11/230https://doaj.org/toc/2313-433XThe objective of this study is to quantitatively evaluate the soil structure behavior when under shear stress to understand the mechanism of shear zone formation using a micro-focus X-ray computed tomography (CT) scanner to visualize the internal samples without causing disturbance. A new image-analysis method was proposed to systematically evaluate the particle length and direction by fitting the particle as an ellipsoid. Subsequently, a direct shear experiment was conducted on soil materials, and shear band was scanned using a micro-focus X-ray CT scanner. After validating the proposed method, the soil structure was evaluated in the shear zone via image analysis on the CT images. Furthermore, the strain inside the specimen was evaluated using digital image correlation. The results showed that a partial change in the particle direction occurred when the volume expansion inside the shear zone exceeded the peak. In addition, the width of the shear zone was ~7.1 times the median grain size of the sand used; however, the region exhibiting a change in the direction of the particles was narrow and confined to the vicinity of the shear plane.Shintaro NoharaToshifumi MukunokiMDPI AGarticleX-ray CTsoil fabric analysisdigital image correlationstrain localizationshearsoil structurePhotographyTR1-1050Computer applications to medicine. Medical informaticsR858-859.7Electronic computers. Computer scienceQA75.5-76.95ENJournal of Imaging, Vol 7, Iss 230, p 230 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	X-ray CT soil fabric analysis digital image correlation strain localization shear soil structure Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95
spellingShingle	X-ray CT soil fabric analysis digital image correlation strain localization shear soil structure Photography TR1-1050 Computer applications to medicine. Medical informatics R858-859.7 Electronic computers. Computer science QA75.5-76.95 Shintaro Nohara Toshifumi Mukunoki Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
description	The objective of this study is to quantitatively evaluate the soil structure behavior when under shear stress to understand the mechanism of shear zone formation using a micro-focus X-ray computed tomography (CT) scanner to visualize the internal samples without causing disturbance. A new image-analysis method was proposed to systematically evaluate the particle length and direction by fitting the particle as an ellipsoid. Subsequently, a direct shear experiment was conducted on soil materials, and shear band was scanned using a micro-focus X-ray CT scanner. After validating the proposed method, the soil structure was evaluated in the shear zone via image analysis on the CT images. Furthermore, the strain inside the specimen was evaluated using digital image correlation. The results showed that a partial change in the particle direction occurred when the volume expansion inside the shear zone exceeded the peak. In addition, the width of the shear zone was ~7.1 times the median grain size of the sand used; however, the region exhibiting a change in the direction of the particles was narrow and confined to the vicinity of the shear plane.
format	article
author	Shintaro Nohara Toshifumi Mukunoki
author_facet	Shintaro Nohara Toshifumi Mukunoki
author_sort	Shintaro Nohara
title	Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
title_short	Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
title_full	Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
title_fullStr	Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
title_full_unstemmed	Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis
title_sort	quantitative evaluation of soil structure and strain in three dimensions under shear using x-ray computed tomography image analysis
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/dc7655f17b7e43c5b19b728afb6f7f6c
work_keys_str_mv	AT shintaronohara quantitativeevaluationofsoilstructureandstraininthreedimensionsundershearusingxraycomputedtomographyimageanalysis AT toshifumimukunoki quantitativeevaluationofsoilstructureandstraininthreedimensionsundershearusingxraycomputedtomographyimageanalysis
_version_	1718411711645483008

Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis

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