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Geomechanics and Engineering Volume 41, Number 2, April25 2025 (Special Issue) pages 199-207 DOI: https://doi.org/10.12989/gae.2025.41.2.199 |
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 open accessSmall-strain stiffness and deformation behavior of cation crosslinked-xanthan gum treated sand |
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Dong-Yeup Park, Jeong-Uk Bang, Minhyeong Lee, Ilhan Chang and Gye-Chun Cho
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| Abstract | ||
| Crosslinked xanthan gum (CrXG) has been introduced to enhance the mechanical stability of biopolymer–soil composites under hydrated conditions. However, its effects on the small-strain stiffness and deformation behavior of granular soils remain underexplored. This study examines the evolution of small-strain shear stiffness, vertical deformation behavior, and shear wave velocity (Vs) in CrXG-treated soils using bender element testing. The results indicate that CrXG treatment improves shear stiffness through a time-dependent gel stiffening mechanism. Higher CrXG concentrations yield greater initial stiffness, with stabilization occurring after approximately 7 days. Additionally, the vertical deformation behavior of CrXG-treated soils is stress-dependent. Increased CrXG concentrations lead to higher Vs values, an elevated a-factor, and a reduced b-exponent, trends that are comparable to those observed in cemented soils. These effects are attributed to the formation of an intergranular hydrogel matrix that enhances particle bonding. These findings provide insights into the mechanical behavior of CrXG-treated soils and their potential applications in geotechnical engineering, particularly for improving soil stiffness and stability. | ||
| Key Words | ||
| biopolymer; crosslinking; curing time; shear wave; stiffness; vertical stress | ||
| Address | ||
| Dong-Yeup Park, Jeong-Uk Bang and Gye-Chun Cho: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea Minhyeong Lee: Disposal Safety Evaluation Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea Ilhan Chang: Department of Civil Systems Engineering, Ajou University, 206 World cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea | ||