Geomechanics and Engineering

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Laboratory triaxial test behavior of xanthan gum biopolymer-treated sands

  • Lee, Sojeong (School of Engineering and Information Technology (SEIT), University of New South Wales (UNSW)) ;
  • Im, Jooyoung (Department of Civil Engineering, Korean Advanced Institute for Science and Technology) ;
  • Cho, Gye-Chun (Department of Civil Engineering, Korean Advanced Institute for Science and Technology) ;
  • Chang, Ilhan (School of Engineering and Information Technology (SEIT), University of New South Wales (UNSW))
  • Received : 2018.10.20
  • Accepted : 2019.02.11
  • Published : 2019.04.10
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Abstract

Gel-type biopolymers have recently been introduced as environmentally friendly soil binders and have shown substantial strengthening effects in laboratory experimental programs. Although the strengthening effects of biopolymer-treated sands have been verified in previous direct shear tests and uniaxial compression tests, there has been no attempt to examine shear behavior under different confining stress conditions. This study therefore aimed to investigate the strengthening effects of biopolymer-treated sand using laboratory triaxial testing with a focus on confining pressures. Three representative confining pressure conditions (${\sigma}_3=50kPa$, 100 kPa, and 200 kPa) were tested with varying biopolymer contents ($m_{bp}/m_s$) of 0.5%, 1.0%, and 2.0%, respectively. Based on previous studies, it was assumed that biopolymer-treated sand is susceptible to hydraulic conditions, and therefore, the experiments were conducted in both a hydrated xanthan gum condition and a dehydrated xanthan gum condition. The results indicated that the shear resistance was substantially enhanced and there was a demonstrable increase in cohesion as well as the friction angle when the biopolymer film matrix was comprehensively developed. Accordingly, it can be concluded that the feasibility of the biopolymer treatment will remain valid under the confining pressure conditions used in this study because the resisting force of the biopolymer-treated soil was higher than that in the untreated condition, regardless of the confining pressure.

Keywords

Acknowledgement

Supported by : Ministry of Land, Infrastructure, and Transport (MOLIT)

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