Particle shape effect on thermal conductivity and shear wave velocity in sands

Changho Lee, Hyoung Suk Suh, Boyeong Yoon, Tae Sup Yun

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This study presents the correlations between quantified shape parameters and geotechnical properties for nine sand specimens. Four shape parameters, sphericity, convexity, elongation and slenderness, were quantified with two-dimensional microscopic images with the aid of image processing techniques. An instrumented oedometer cell is used to measure compressibility, thermal conductivity and shear wave velocity during loading, unloading and reloading stages. As the particle shape inherently determines the initial loose packing condition, initial void ratio and shape parameters are well correlated with compressibility. The applied stress in soils increases the interparticle contact area and contact quality; round particles tend to achieve higher thermal conductivity and shear wave velocity during stress-induced volume change. Multiple linear regression is implemented to capture the relative contributions of involved variables, revealing that the thermal evolution is governed by the initial packing density and particle shape. The experimental observations underscore the predominant effect that particle shape has on the geomechanical and physical properties upon stress-induced soil behavior.

Original languageEnglish
Pages (from-to)615-625
Number of pages11
JournalActa Geotechnica
Volume12
Issue number3
DOIs
Publication statusPublished - 2017 Jun 1

Fingerprint

Shear waves
thermal conductivity
wave velocity
S-wave
Thermal conductivity
Sand
Compressibility
sand
Soils
compressibility
Unloading
Linear regression
Elongation
Image processing
Physical properties
void ratio
thermal evolution
geotechnical property
volume change
unloading

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Lee, Changho ; Suh, Hyoung Suk ; Yoon, Boyeong ; Yun, Tae Sup. / Particle shape effect on thermal conductivity and shear wave velocity in sands. In: Acta Geotechnica. 2017 ; Vol. 12, No. 3. pp. 615-625.
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Particle shape effect on thermal conductivity and shear wave velocity in sands. / Lee, Changho; Suh, Hyoung Suk; Yoon, Boyeong; Yun, Tae Sup.

In: Acta Geotechnica, Vol. 12, No. 3, 01.06.2017, p. 615-625.

Research output: Contribution to journalArticle

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AB - This study presents the correlations between quantified shape parameters and geotechnical properties for nine sand specimens. Four shape parameters, sphericity, convexity, elongation and slenderness, were quantified with two-dimensional microscopic images with the aid of image processing techniques. An instrumented oedometer cell is used to measure compressibility, thermal conductivity and shear wave velocity during loading, unloading and reloading stages. As the particle shape inherently determines the initial loose packing condition, initial void ratio and shape parameters are well correlated with compressibility. The applied stress in soils increases the interparticle contact area and contact quality; round particles tend to achieve higher thermal conductivity and shear wave velocity during stress-induced volume change. Multiple linear regression is implemented to capture the relative contributions of involved variables, revealing that the thermal evolution is governed by the initial packing density and particle shape. The experimental observations underscore the predominant effect that particle shape has on the geomechanical and physical properties upon stress-induced soil behavior.

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