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利用原位X射线计算机断层扫描成像技术对一维压缩下粒状土颗粒级结构与形态的研究

A Study of the Particle-Level Fabric and Morphology of Granular Soils under One-Dimensional Compression Using Insitu X-ray CT Imaging.

作者信息

Alam Md Ferdous, Haque Asadul, Ranjith Pathegama Gamage

机构信息

Department of Civil Engineering, Monash University, Melbourne, Victoria 3800, Australia.

出版信息

Materials (Basel). 2018 May 29;11(6):919. doi: 10.3390/ma11060919.

DOI:10.3390/ma11060919
PMID:29844280
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6025614/
Abstract

The particle morphology and fabric of a granular soil influence its mechanical behavior. This study focuses on the evolution of the particle-level fabric and morphology of a uniformly graded sand sample subjected to one-dimensional compression up to 64 MPa. The microstructural changes with increased stresses were captured using in situ high-resolution X-ray computed tomography (X-ray CT) imaging. The processed images of particles were separated using the Monash Particle Separation Method (MPSM) for subsequent fabric and morphological analyses. The variations of various fabric parameters were studied using the separated particle volumes. New methods of assessing the morphology and crushability of particles were introduced including a comprehensive algorithm for determining coordination number, branch and contact normal vectors. Results of all fabric parameters were analyzed and discussed with reference to observed changes. Potential mechanisms were identified and relevant correlations were developed where warranted.

摘要

粒状土的颗粒形态和结构会影响其力学行为。本研究聚焦于均匀级配砂样在一维压缩至64MPa过程中颗粒级结构和形态的演变。利用原位高分辨率X射线计算机断层扫描（X射线CT）成像捕捉应力增加时的微观结构变化。使用莫纳什颗粒分离方法（MPSM）分离颗粒的处理图像，以便进行后续的结构和形态分析。利用分离出的颗粒体积研究各种结构参数的变化。引入了评估颗粒形态和可压碎性的新方法，包括确定配位数、分支和接触法线向量的综合算法。参照观察到的变化对所有结构参数的结果进行了分析和讨论。确定了潜在机制，并在必要时建立了相关的相关性。

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本文引用的文献

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A New Cluster Analysis-Marker-Controlled Watershed Method for Separating Particles of Granular Soils.一种用于分离颗粒土颗粒的新型聚类分析-标记控制分水岭方法。
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2
X-ray Computed Tomography Imaging of the Microstructure of Sand Particles Subjected to High Pressure One-Dimensional Compression.高压一维压缩下砂粒微观结构的X射线计算机断层扫描成像
Materials (Basel). 2016 Nov 3;9(11):890. doi: 10.3390/ma9110890.
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A cluster separation measure.一种聚类分离度量。
颗粒形态对圆形和角形天然砂刚度、强度及体积特性的影响
Materials (Basel). 2021 Jun 2;14(11):3023. doi: 10.3390/ma14113023.
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