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Article

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

1
Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi 270-1194, Chiba, Japan
2
Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto-shi 860-8555, Kumamoto, Japan
3
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto-shi 860-8555, Kumamoto, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Joana Fonseca
J. Imaging 2021, 7(11), 230; https://doi.org/10.3390/jimaging7110230
Received: 27 September 2021 / Revised: 25 October 2021 / Accepted: 27 October 2021 / Published: 29 October 2021
(This article belongs to the Special Issue Recent Advances in Image-Based Geotechnics)
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. View Full-Text
Keywords: X-ray CT; soil fabric analysis; digital image correlation; strain localization; shear; soil structure X-ray CT; soil fabric analysis; digital image correlation; strain localization; shear; soil structure
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MDPI and ACS Style

Nohara, S.; Mukunoki, T. Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis. J. Imaging 2021, 7, 230. https://doi.org/10.3390/jimaging7110230

AMA Style

Nohara S, Mukunoki T. Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis. Journal of Imaging. 2021; 7(11):230. https://doi.org/10.3390/jimaging7110230

Chicago/Turabian Style

Nohara, Shintaro, and Toshifumi Mukunoki. 2021. "Quantitative Evaluation of Soil Structure and Strain in Three Dimensions under Shear Using X-ray Computed Tomography Image Analysis" Journal of Imaging 7, no. 11: 230. https://doi.org/10.3390/jimaging7110230

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