Pore directivity of soils subjected to shearing: Numerical simulation and image processing

Dong Hun Kang, Jung Hwoon Lee, Jinhyun Choo, Tae Sup Yun

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

3 Citations (Scopus)

Abstract

Soils subjected to shearing experience dilation or contraction depending on their initial porosity, and the relative displacement of individual particles determines a soil's unique particle-pore microstructure during volume change. It has been suggested that soil microstructure tends to be stabilized as pores are aligned parallel to the loading direction as particles are mobilized. We explore the evolution of internal pore fabric and directivity during direct shear conditions in which a constrained boundary hampers the full mobilization of particles. Two representative volumetric responses for dense and loose granular soils during direct shear are simulated via the discrete element method. The arbitrarily shaped pore structure in 3D space is quantified using best-fitting ellipsoids to evaluate pore characteristics. Changes in pore fabric are analyzed based on local porosity, pore size distribution, and geometrical configuration of fitted ellipsoids. Results show that initial porosity determines the characteristic pore evolution during shearing. Numerical results also demonstrate that a pore elongation oriented in the direction of the shear manifests under dense packing, while randomly distributed pore directivity is observed under loose packing.

Original languageEnglish
Title of host publicationGeoCongress 2012
Subtitle of host publicationState of the Art and Practice in Geotechnical Engineering
Pages2342-2351
Number of pages10
Edition225 GSP
DOIs
Publication statusPublished - 2012 Dec 1
EventGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering - Oakland, CA, United States
Duration: 2012 Mar 252012 Mar 29

Publication series

NameGeotechnical Special Publication
Number225 GSP
ISSN (Print)0895-0563

Other

OtherGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
CountryUnited States
CityOakland, CA
Period12/3/2512/3/29

All Science Journal Classification (ASJC) codes

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

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    Kang, D. H., Lee, J. H., Choo, J., & Yun, T. S. (2012). Pore directivity of soils subjected to shearing: Numerical simulation and image processing. In GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering (225 GSP ed., pp. 2342-2351). (Geotechnical Special Publication; No. 225 GSP). https://doi.org/10.1061/9780784412121.240