Investigation of localized deformation in partially saturated sand under triaxial compression using microfocus X-ray CT with digital image correlation

Higo, Yosuke; Oka, Fusao; Sato, Tomohiro; Matsushima, Yoshiki; Kimoto, Sayuri

doi:10.1016/j.sandf.2013.02.001

Cited by 129 publications

(50 citation statements)

References 29 publications

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“…The physical properties include a particle density of 2.64 g/cm 3 , a maximum void ratio of 0.975, a minimum void ratio of 0.614, a D50 of 185μm and a uniformity coefficient of 1.6.…”

Section: Test Sample and Testing Programmentioning

confidence: 99%

“…The soil, water and air phases are segmented from the original image using the region growing method (Higo et al, 2013(Higo et al, , 2014. Since x-ray CT images are an assembly of discrete gray values, they inherently have an artifact referred as the partial volume effect: voxels shared by two phases (mixel) with a gray value equal to the average between grain and air gray values.…”

Section: Trinarisationmentioning

confidence: 99%

See 1 more Smart Citation

Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation

Higo

Morishita

Kido

et al. 2016

JGS Special Publication

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In the present study, water-retention behaviour of sand during drying and wetting process has been observed microscopically using micro x-ray computed tomography (CT). CT images taken at different water-retention states during drying and wetting paths are trinarised to segment the images into the soil, water and air phases. The segmentation technique using region growing method takes into account uniform distribution of the mixels to reduce the inherent partial volume effect. Using the trinarised images, local porosity and degree of saturation are calculated for the cubic subsets centered at reference points, and then frequency maps of the two local values are drawn. Through the comparison of the frequency maps, the relation between the local porosity and the degree of saturation and the changes in the relation during drying and wetting process are discussed.

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“…The physical properties include a particle density of 2.64 g/cm 3 , a maximum void ratio of 0.975, a minimum void ratio of 0.614, a D50 of 185μm and a uniformity coefficient of 1.6.…”

Section: Test Sample and Testing Programmentioning

confidence: 99%

Section: Trinarisationmentioning

confidence: 99%

Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation

Higo

Morishita

Kido

et al. 2016

JGS Special Publication

Self Cite

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“…Because of these problems, it is necessary to use in-situ X-ray tomography [21] to fully understand the mechanism of deformation. Although this method has been applied in the experimental researches of some rocks [22][23][24][25][26][27], it has not been carried out to study the progressive deformation-failure process of compact shale due to the limitation of X-ray scanning energy and loading apparatus capacity.…”

Section: Introductionmentioning

confidence: 99%

Study on the Progressive Failure Characteristics of Longmaxi Shale under Uniaxial Compression Conditions by X-ray Micro-Computed Tomography

Duan

et al. 2017

Energies

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Abstract:To investigate the deformation-failure process of Longmaxi shale under uniaxial compression conditions from the mesoscopic and macroscopic points of view, novel X-ray micro-Computed Tomography (micro-CT) equipment combined with unique loading apparatus was used. Cylindrical shale samples (4 mm in diameter and 8 mm in height) were produced to perform a series of uniaxial compression tests. CT scanning images at different time points during the loading process were obtained to study the characteristics of the progressive failure. In addition, stereograms were reconstructed and vertical slices were selected to explain the failure mechanism. From the results of the testing the low-density area, local per-peak cracks, numerous post-peak cracks and secondary cracks consecutively appeared in the CT images. Vertical and inclined fissures in the samples could be observed from the stereograms' surfaces and from internal slices. The cracking indicates that the failure process of shale is progressive and the failure mechanism of shale under uniaxial compression is mainly tension destruction or comprehensive tension-shear destruction.

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“…In addition, the region of the localisation has been observed microscopically by the partial CT scanning with a micron scale of high spatial resolution. Changes in the microstructures have been discussed through trinarization of the CT images using a region growing segmentation technique (Higo et al 2013(Higo et al , 2014, by which the soil particles, the pore water, and the pore air have been distinguished from each other.…”

Section: Resultsmentioning

confidence: 99%

Bifurcation and Degradation of Geomaterials in the New Millennium

Chau¹,

Zhao²

2015

Springer Series in Geomechanics and Geoengineering

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About this SeriesGeomechanics deals with the application of the principle of mechanics to geomaterials including experimental, analytical and numerical investigations into the mechanical, physical, hydraulic and thermal properties of geomaterials as multiphase media. Geoengineering covers a wide range of engineering disciplines related to geomaterials from traditional to emerging areas.The objective of the book series is to publish monographs, handbooks, workshop proceedings and textbooks. The book series is intended to cover both the state-ofthe-art and the recent developments in geomechanics and geoengineering. Besides researchers, the series provides valuable references for engineering practitioners and graduate students.More information about this series at

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Investigation of localized deformation in partially saturated sand under triaxial compression using microfocus X-ray CT with digital image correlation

Cited by 129 publications

References 29 publications

Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation

Local water-retention behaviour of sand during drying and wetting process observed by micro x-ray tomography with trinarisation

Study on the Progressive Failure Characteristics of Longmaxi Shale under Uniaxial Compression Conditions by X-ray Micro-Computed Tomography

Bifurcation and Degradation of Geomaterials in the New Millennium

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