Geomechanics and Engineering

  • 제17권5호
  • /
  • Pages.453-464
  • /
  • 2019
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  • 2005-307X(pISSN)
  • /
  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Geotechnical engineering behavior of biopolymer-treated soft marine soil

  • Kwon, Yeong-Man (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Chang, Ilhan (School of Engineering and Information Technology, University of New South Wales (UNSW)) ;
  • Lee, Minhyeong (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Cho, Gye-Chun (Department of Civil Engineering, Korea Advanced Institute for Science and Technology)
  • 투고 : 2018.10.10
  • 심사 : 2019.02.18
  • 발행 : 2019.04.10
⟨ 이전 논문 다음 논문 ⟩

초록

Soft marine soil has high fine-grained soil content and in-situ water content. Thus, it has low shear strength and bearing capacity and is susceptible to a large settlement, which leads to difficulties with coastal infrastructure construction. Therefore, strength improvement and settlement control are essential considerations for construction on soft marine soil deposits. Biopolymers show their potential for improving soil stability, which can reduce the environmental drawbacks of conventional soil treatment. This study used two biopolymers, an anionic xanthan gum biopolymer and a cationic ${\varepsilon}-polylysine$ biopolymer, as representatives to enhance the geotechnical engineering properties of soft marine soil. Effects of the biopolymers on marine soil were analyzed through a series of experiments considering the Atterberg limits, shear strength at a constant water content, compressive strength in a dry condition, laboratory consolidation, and sedimentation. Xanthan gum treatment affects the Atterberg limits, shear strength, and compressive strength by interparticle bonding and the formation of a viscous hydrogel. However, xanthan gum delays the consolidation procedure and increases the compressibility of soils. While ${\varepsilon}-polylysine$ treatment does not affect compressive strength, it shows potential for coagulating soil particles in a suspension state. ${\varepsilon}-Polylysine$ forms bridges between soil particles, showing an increase in settling velocity and final sediment density. The results of this study show various potential applications of biopolymers. Xanthan gum biopolymer was identified as a soil strengthening material, while ${\varepsilon}-polylysine$ biopolymer can be applied as a soil-coagulating material.

키워드

과제정보

연구 과제 주관 기관 : Ministry of Land, Infrastructure, and Transport (MOLIT), National Research Foundation of Korea (NRF)

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