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Student Number 82342010
Author Lai-Song Kuo(ӪQ)
Author's Email Address No Public.
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Department Civil Engineering
Year 1997
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language zh-TW.Big5 Chinese
Title A Study on Packing Fabric Evolution of Granular material
Date of Defense
Page Count 312
Keyword
  • fabric
  • granular material
  • image analysis
  • void ratio
  • Abstract In this study, thin-sections obtained for standard sand
    prepared at different relative density and various stages in
    direct shear test were analyzed using image processing
    techniques to investigate the fabric evolution of particulate
    materials. To provide a numerical means for investigating the
    fabric of particulate material, a program was developed using
    DEM to simulate 3D direct shear behavior of sphere particles.
    The fabric parameters analyzed included void area, void shape,
    and local void ratio, with emphasis on the changes in frequency
    distribution of local void ratio upon shearing.  The results
    indicate that the evolution of local void ratio frequency
    distribution of standard sands and sphere particles, from
    initial to peak shearing stress states, can be characterized by
    a critical void ratio that is equivalent to the average void
    ratio of the initial state. As samples are sheared, the
    frequency distribution of local void ratio less than the
    critical void ratio increases, and that of local void ratio
    greater than the critical void ratio decreases. At both initial
    and peak shearing stress states, can be statistically described
    by the beta distribution. With the increase of the number of
    local void ratio measured, the mean value and standard deviation
    derived on fabric parameters decrease accordingly. It is
    recommended that the number of the local void ratio in a section
    for studying fabric be over 200.
    Table of Content
    Reference
    Advisor
  • Wei-Hsing Huang(y)
  • Files No Any Full Text File.
    Date of Submission

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