Isotropic compression behavior of granular assembly with non-spherical particles by X-ray micro-computed tomography and discrete element modeling

Nan Zhang, Ahmadreza Hedayat, Shaoyang Han, Runlin Yang, Héctor Gelber Bolaños Sosa, Juan José González Cárdenas, Guido Edgard Salas Álvarez

Research output: Contribution to journalArticlepeer-review

Abstract

The particle morphological properties, such as sphericity, concavity and convexity, of a granular assembly significantly affect its macroscopic and microscopic compressive behaviors under isotropic loading condition. However, limited studies on investigating the microscopic behavior of the granular assembly with real particle shapes under isotropic compression were reported. In this study, X-ray computed tomography (μCT) and discrete element modeling (DEM) were utilized to investigate isotropic compression behavior of the granular assembly with regard to the particle morphological properties, such as particle sphericity, concavity and interparticle frictions. The μCT was first used to extract the particle morphological parameters and then the DEM was utilized to numerically investigate the influences of the particle morphological properties on the isotropic compression behavior. The image reconstruction from μCT images indicated that the presented particle quantification algorithm was robust, and the presented microscopic analysis via the DEM simulation demonstrated that the particle surface concavity significantly affected the isotropic compression behavior. The observations of the particle connectivity and local void ratio distribution also provided insights into the granular assembly under isotropic compression. Results found that the particle concavity and interparticle friction influenced the most of the isotropic compression behavior of the granular assemblies.

Original languageEnglish
JournalJournal of Rock Mechanics and Geotechnical Engineering
DOIs
StateAccepted/In press - 2021

Bibliographical note

Funding Information:
Nan Zhang is currently a research associate in the Department of Civil and Environmental Engineering at Colorado School of Mines (CSM). Prior to joining CSM, he worked as a postdoctoral fellow in Pacific Marine Energy Center (PMEC) at Oregon State University, USA, for one year. Dr. Zhang earned his BS and MS degrees of Water Resources and Hydropower Engineering and Hydraulic Structural Engineering from Chongqing Jiaotong University, Chongqing and Hohai University, Nanjing, China, respectively. Shortly after his graduation, he joined Oregon State University, USA, and earned his PhD degree of Civil Engineering specialized in Geomechanics. Dr. Zhang has a strong research interest in the development of computational models and experimental studies for the applications for both traditional and mining geotechnical engineering. Emphasis is placed on the main tracks as (1) numerical modeling of soil-structure interaction and offshore anchors, (2) granular mechanics, (3) mine tailings, and (4) geopolymer concrete. He has been participated in US National Science Foundation (NSF) and Department of Energy (DOE) projects and other projects from Peru.

Funding Information:
The financial support provided by the Universidad Nacional de San Agustín (UNSA) through the joint Center for Mining Sustainability with the Colorado School of Mines is highly acknowledged. The authors would thank the Information and Technology Solutions (ITS) at Colorado School of Mines for the computational assistances provided for this work. The authors also highly acknowledge the anonymous reviewers for their constructive comments that improved this work to a better level.

Funding Information:
The financial support provided by the Universidad Nacional de San Agust?n (UNSA) through the joint Center for Mining Sustainability with the Colorado School of Mines is highly acknowledged. The authors would thank the Information and Technology Solutions (ITS) at Colorado School of Mines for the computational assistances provided for this work. The authors also highly acknowledge the anonymous reviewers for their constructive comments that improved this work to a better level.

Publisher Copyright:
© 2021 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

Keywords

  • Discrete element modeling (DEM)
  • Isotropic compression
  • Particle morphology
  • Particle surface curvature
  • X-ray computed tomography (μCT)

Fingerprint

Dive into the research topics of 'Isotropic compression behavior of granular assembly with non-spherical particles by X-ray micro-computed tomography and discrete element modeling'. Together they form a unique fingerprint.

Cite this