Microscopic dynamics of sand particles based on X-ray computed tomography and in-situ triaxial compression

doi:10.3785/j.issn.1008-973X.2023.08.012

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (8): 1597-1606 DOI: 10.3785/j.issn.1008-973X.2023.08.012

Microscopic dynamics of sand particles based on X-ray computed tomography and in-situ triaxial compression

Ze-kai MIAO1,2(

),Da-ren ZHANG1,2,Gang MA1,2,*(

),Yu-xiong ZOU1,2,Yuan CHEN3,Wei ZHOU1,2,Yu-xuan XIAO4

1. State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China
2. Institute of Water Engineering Sciences, Wuhan University, Wuhan 430072, China
3. CISPDR Corporation, Wuhan 430010, China
4. China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan 430063, China

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Abstract

X-ray computed tomography (CT) and in-situ triaxial shear test were combined to analyze the microscopic dynamics evolution of Ottawa sand under triaxial compression. A total of 15 X-ray scans were taken during the experiment. The particles were separated by the image segmentation algorithm and reconstructed by spherical harmonic functions. The particles were matched exactly and tracked during the loading process based on the multi-scale morphological indicators of particles, and the evolution of microscopic dynamics and microscopic structural indicators, such as particle displacement, rotation, local non-affine motion, and local porosity were analyzed. During the shear process, the vertical displacement distribution of the particle system presents two conical regions, and the rotational distribution of the particles exhibits obvious X-shaped shear bands. The local non-affine motion, which was used to measure the local plastic deformation, was significantly correlated with the local volume fraction, suggesting a causal relationship between the microscopic dynamics and particle microstructure, i.e., plastic deformation was more likely to occur where the local free volume was large.

Key words： granular material X-ray computed tomography (CT) triaxial compression microscopic dynamics microstructure

Received: 18 September 2022 Published: 31 August 2023

CLC:	TU 43
	TV 641

Fund: 国家重点研发计划资助项目(2022YFC3005503)；国家自然科学基金资助项目(51825905，U1865204)；云南省重大科技专项计划资助项目(202202AF080004)

Corresponding Authors: Gang MA E-mail: 2016301580064@whu.edu.cn;magang630@whu.edu.cn

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	Ze-kai MIAO
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	Yu-xuan XIAO

Cite this article:

Ze-kai MIAO,Da-ren ZHANG,Gang MA,Yu-xiong ZOU,Yuan CHEN,Wei ZHOU,Yu-xuan XIAO. Microscopic dynamics of sand particles based on X-ray computed tomography and in-situ triaxial compression. Journal of ZheJiang University (Engineering Science), 2023, 57(8): 1597-1606.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.08.012 OR https://www.zjujournals.com/eng/Y2023/V57/I8/1597

基于X-ray CT原位三轴剪切试验的砂土颗粒材料微观动力学

将X射线断层扫描技术(CT)与原位三轴剪切试验相结合，分析渥太华砂在剪切过程中的微观动力学演化规律. 在试验过程中共完成15次X射线扫描，使用图像分割算法进行颗粒分割并使用球谐函数重构颗粒的表面形貌，根据颗粒的多尺度形态指标序列实现整个加载过程中颗粒的准确匹配与追踪，并分析颗粒位移、转动、局部非仿射运动和局部孔隙率等微观动力学和微观结构指标的演化规律. 在剪切过程中颗粒体系的竖向位移分布呈现2个锥形区域，颗粒的转动分布出现明显的X型剪切带. 用于度量局部塑性变形程度的局部非仿射运动和局部体积分数呈现出较为明显的相关关系，表明颗粒微观动力学与其微观结构之间存在因果关系，局部自由体积较大的地方更易发生塑性变形.

关键词： 颗粒材料, X射线断层扫描(CT), 三轴试验, 微观动力学, 微观结构

Fig.1 Triaxial test device for CT

Fig.2 Ottawa sand and its images obtained by scanning electron microscope

Fig.3 Ottawa sand particle size distribution chart

Fig.4 Triaxial sample preparation process

Fig.5 Macroscopic mechanical response curve of Ottawa sand triaxial shear test

Fig.6 Watershed algorithm processing of scanned images

Fig.7 Gray-scale value distribution of CT image

Fig.8 Spherical harmonic reconstruction results of granular

Fig.9 Evolution of frequency distribution of Ottawa sand grain shape parameters

Fig.10 Schematic diagram of particle matching process

Fig.11 Deviation of particle shape parameters of two matching algorithms

Fig.12 Increment of particle vertical displacement

Fig.13 Particle rotation angle

Fig.14 Spatial distribution of nonaffine motion of particles under three axial strain states

Fig.15 Evolution of frequency distribution of coordination number during shearing

Fig.16 Evolution of frequency distribution of local volume fraction during shearing

Fig.17 Effect of coordination number on nonaffine motion of particles

Fig.18 Effect of local volume fraction on nonaffine motion of particles


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