Evolution of pore orientation in granular media under biaxial compression

Dong Hun Kang, Tae Sup Yun, T. Matthew Evans

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Pores in granular media tend to align parallel to maximum stress upon direct shear and creep conditions. We herein numerically investigate the evolution of pore orientation under biaxial compression using 2D particle assemblies in conjunction with image analysis, in particular for the case of particle clumps bounded by flexible wall. The discrete element method produces the dense and loose packings where two particles are clumped to closely simulate the nonspherical particles followed by biaxial compression. The Delaunay triangulation and polygonization allow construction of unit pore space whose irregular shape is fitted by an ellipse. This helps characterize the orientation of each unit pore and quantify the pore size distribution at each strain regime. The simulated results are analyzed within the framework of local void ratio and elongation factor. The initial void ratio uniquely determines the development of elongation factor with strain and pores aligned toward the direction of maximum compression. Its manifestation is pronounced near the regime of shear band attributed to the formation arching for stabilizing the macroscale particle network.

Original languageEnglish
Title of host publicationGeo-Congress 2014 Technical Papers
Subtitle of host publicationGeo-Characterization and Modeling for Sustainability - Proceedings of the 2014 Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Number of pages9
Edition234 GSP
ISBN (Print)9780784413272
Publication statusPublished - 2014
Event2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014 - Atlanta, GA, United States
Duration: 2014 Feb 232014 Feb 26

Publication series

NameGeotechnical Special Publication
Number234 GSP
ISSN (Print)0895-0563


Other2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014
Country/TerritoryUnited States
CityAtlanta, GA

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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