Characterization of geomechanical and hydraulic properties of non-wettable sands

D. Kim, H. J. Yang, T. S. Yun, Byeongsu Kim, S. Kato, S. W. Park

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

Wildfire, diagenesis, and organic contamination often induce the non-wettability in soils which in turn dominate physico-mechanical behaviours and control the contact angle and capillary pressure. This study presents the characterization of hydraulic and geomechanical properties of non-wettable sands using artificially synthesized hydrophobic sands. The critical hydrostatic pressure that initiates the fluid intrusion into dry hydrophobic sands is measured to estimate permeation boundary. Hydraulic conductivity values of both hydrophilic and hydrophobic sands under fully saturated condition are examined to evaluate the drag force effect. For geomechanical study, a series of constant water content compression tests are performed to assess the mechanical behavior on a reconstituted specimen of unsaturated non-wettable sands. The stress-strain relationships according to the degree of saturation under confining pressure condition are observed so as to derive the suction stresses. Results highlight that the surface modification at nano-scale determine the spatial configuration of water phase in pore space and its impact on fluid flow and strength with varying degree of saturation prevails.

Original languageEnglish
Pages361-364
Number of pages4
Publication statusPublished - Jan 1 2013
Externally publishedYes
Event18th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2013 - Paris, France
Duration: Sep 2 2013Sep 6 2013

Other

Other18th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2013
CountryFrance
CityParis
Period9/2/139/6/13

Keywords

  • Critical pressure
  • Friction angle
  • Hydraulic conductivity
  • Non-wettable sands
  • Water repellency

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Kim, D., Yang, H. J., Yun, T. S., Kim, B., Kato, S., & Park, S. W. (2013). Characterization of geomechanical and hydraulic properties of non-wettable sands. 361-364. Paper presented at 18th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2013, Paris, France.