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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (8): 1597-1606    DOI: 10.3785/j.issn.1008-973X.2023.08.012
土木工程、交通工程     
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
苗泽锴1,2(),张大任1,2,马刚1,2,*(),邹宇雄1,2,陈远3,周伟1,2,肖宇轩4
1. 武汉大学 水资源工程与调度全国重点实验室，湖北 武汉 430072
2. 武汉大学 水工程科学研究院，湖北 武汉 430072
3. 长江设计集团有限公司，湖北 武汉 430010
4. 中铁第四勘察设计院集团有限公司，湖北 武汉 430063
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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摘要：

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    
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
收稿日期: 2022-09-18 出版日期: 2023-08-31
CLC:  TU 43  
基金资助: 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)
通讯作者: 马刚     E-mail: 2016301580064@whu.edu.cn;magang630@whu.edu.cn
作者简介: 苗泽锴（1998—），男，硕士生，从事高坝结构数值仿真研究. orcid.org/0000-0003-1806-4910. E-mail： 2016301580064@whu.edu.cn
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苗泽锴
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引用本文:

苗泽锴,张大任,马刚,邹宇雄,陈远,周伟,肖宇轩. 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[J]. 浙江大学学报(工学版), 2023, 57(8): 1597-1606.

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.

链接本文:

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

图 1  适用于CT的三轴试验装置
图 2  渥太华砂及其扫描电镜图像
图 3  渥太华砂粒度分布图
图 4  三轴试样制备流程
图 5  渥太华砂三轴剪切试验宏观力学响应曲线
图 6  扫描图像的分水岭算法处理过程
图 7  CT图像灰度分布图
图 8  颗粒球谐重构结果
图 9  渥太华砂形状参数的频率分布演化
图 10  颗粒匹配过程示意图
图 11  2种匹配算法的颗粒形态参数偏差
图 12  颗粒竖直向位移增量
图 13  颗粒转动角度
图 14  3个轴向应变状态下的颗粒非仿射运动空间分布
图 15  剪切过程中配位数频率的分布演化
图 16  剪切过程中局部体积分数频率的分布演化
图 17  配位数对于颗粒非仿射运动的影响
图 18  局部体积分数对于颗粒非仿射运动的影响
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