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• W2942802717 abstract "This paper explores the micro characteristics of unsaturated sand in triaxial shearing by using X-ray computed tomography (X-ray CT). To obtain higher resolution, a mini-triaxial set-up is designed in which the sample is miniaturised to 1 cm in diameter and 2 cm long, allowing scans with a pixel size of 9 μm. Samples are sheared in the mini-triaxial set-up at different constant suction levels (therefore, different degree of saturation). In the meanwhile, the samples are scanned by X-ray CT at various deformation stages, about 0, 2, 5, 10 and 15% axial strain. The three-dimensional (3D) reconstructed image is trinarised based on a region growing technique, which gives access to the microstructure of the solid, liquid and air phases. Then, the 3D image is subdivided into representative volume elements, with length ≈3·8D 50 , which gives local information of degree of saturation and porosity. It is observed that the sample dilates and water drains out during triaxial test under constant suction condition. The local study shows that the porosity increase and water desaturation are more significant in the middle part of the sample, especially for a higher suction value. This work allows the emphasis of the coupling between dilatancy on shearing (highlighted by the evolution of local porosity) and the evolution of the local degree of saturation in unsaturated granular materials." @default.
• W2942802717 created "2019-05-09" @default.
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• W2942802717 date "2019-12-01" @default.
• W2942802717 modified "2023-09-30" @default.
• W2942802717 title "Micro-scale investigation of unsaturated sand in mini-triaxial shearing using X-ray CT" @default.
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• W2942802717 doi "https://doi.org/10.1680/jgele.18.00214" @default.
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