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Volume 47 Issue 1
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OUYANG Miao, ZHANG Hongri, DENG Renrui, WANG Guiyao, XIAO Jie, ZHAO Ya. Development of cracks in expansive soil improved by xanthan gum biopolymer[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(1): 106-114. DOI: 10.11779/CJGE20230989
Citation: OUYANG Miao, ZHANG Hongri, DENG Renrui, WANG Guiyao, XIAO Jie, ZHAO Ya. Development of cracks in expansive soil improved by xanthan gum biopolymer[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(1): 106-114. DOI: 10.11779/CJGE20230989
shu

Development of cracks in expansive soil improved by xanthan gum biopolymer

  • 1.

    School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China

  • 2.

    Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, China

  • 3.

    Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

  • 4.

    School of Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China

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  • Received Date: October 09, 2023
  • Available Online: April 17, 2024
    Graphical Abstract
    • Abstract
  • The use of xanthan gum biopolymer, which can suppress the expansion of cracks of in expansive soil without affecting the growth of slope vegetation, is a new approach for ecological protection of expansive soil slopes. The indoor wet dry cycle tests are conducted on the xanthan gum-modified expansive soil, and the digital image processing technology is used to quantitatively analyze the entire process of crack development. The influences of xanthan gum content on the characteristic indices of crack morphology in expansive soil are explored, and the changes in microstructure and mineral composition of expansive soil before and after improvement are analyzed through the scanning electron microscopy and X-ray diffraction experiments, The improvement mechanism of xanthan gum on expansive soil is explored based on the results of the expansion rate tests. The research results indicate that the addition of xanthan gum can effectively improve the water retention and crack resistance of expansive soil, and the average water loss rate and crack rate of the sample decrease with the increase of dosage. The Xanthan gum can reduce the impact of wetting-drying cycle on expansive soil, control the crack width within a small range, and make it easy to close during the humidification process. It mainly inhibits the cracking of expansive soil through two aspects. On the one hand, it forms a "bridging" structure with soil particles through bonding and cementation, enhancing the overall tensile strength of the soil. On the other hand, by filling and film-forming, it blocks the contact between water and soil particles, reducing the thickness of the hydration film of clay minerals.
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