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地学领域高质量科技期刊分级T2区（2023）

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Volume 44 Issue 1
Jan.  2025
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Article Navigation >  Bulletin of Geological Science and Technology  > 2025  >  44(1): 175-184
LI Jun，ZHANG Weili，CHEN Zongwu，et al. Effect of freeze-thaw cycles on the properties of MICP-treated soil[J]. Bulletin of Geological Science and Technology，2025，44（1）：175-184 doi: 10.19509/j.cnki.dzkq.tb20230462
Citation: LI Jun，ZHANG Weili，CHEN Zongwu，et al. Effect of freeze-thaw cycles on the properties of MICP-treated soil[J]. Bulletin of Geological Science and Technology，2025，44（1）：175-184 doi: 10.19509/j.cnki.dzkq.tb20230462
shu

Effect of freeze-thaw cycles on the properties of MICP-treated soil

doi: 10.19509/j.cnki.dzkq.tb20230462
  • 1.

    Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China

  • 2.

    State Key Laboratory of Green Building Materials, China General Research Institute of Building Materials Science Co., Beijing 100024, China

More Information
  • Author Bio:

    E-mail：LiJun306@cug.edu.cn

  • Corresponding author: E-mail：zwl@cug.edu.cn
  • Received Date: 11 Aug 2023
  • Accepted Date: 14 Dec 2023
  • Rev Recd Date: 13 Dec 2023
    • Available Online: 18 Dec 2023
    Abstract
  • Objective

    The microbial induced carbonate precipitation (MICP) technology has received widespread attention from the academic community and has also made certain progress in the field of soil reinforcement. After MICP, the overall performance of the soil is improved, but the cyclic effect of winter freezing and spring thawing gradually loosens the soil structure, resulting in a decrease in soil strength, erosion resistance, and water retention capacity. Currently, there is limited research on the impact of freeze-thaw cycles on the properties of MICP stabilized soil.

    Methods

    This study investigated the effects of freeze-thaw cycles on the unconfined compressive strength (UCS), erosion resistance, and water retention capacity of soil treated with MICP under different conditions. The surfaces of the samples were treated via the spray method, and then, some samples were subjected to erosion tests. The UCS and water evaporation rate of the samples under different numbers of freeze-thaw cycles were tested. Combining the mechanism of soil resistance to erosion damage and the test results of samples subjected to freeze-thaw cycles, the reasons for the deterioration of reinforced soil properties due to freeze-thaw cycles were investigated.

    Results

    The results revealed that the UCS of the sample increased from 43.83 kPa to 69.92 kPa after MICP treatment. After 20 freeze-thaw cycles, the UCS value of the MICP-treated sample was 1.48 times greater than that of the uncured sample, and the erosion amount of the MICP-treated sample was much less than half of that of the uncured sample. Research has shown that microbial induced calcium carbonate deposits can effectively fill the internal pores of the soil and bind loose soil particles, significantly improving the soil strength and effectively weakening the destructive effect of freeze-thaw cycles on the soil.

    Conclusion

    Although the reinforcement effect of the soil gradually deteriorated due to the increase in the number of freeze-thaw cycles, the MICP-treated soil still had high strength in a short-term freeze-thaw environment and could effectively resist the erosion effect of rainwater.

     

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