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<p>Internal erosion poses a substantial threat to geotechnical structures, including embankments and dams, with conventional stabilization methods often limited by environmental and economic constraints. This study examines the efficacy of Microbially Induced Calcite Precipitation (MICP) in enhancing the erosion resistance of sandy soils via controlled laboratory experiments. Upward seepage Hole Erosion Tests (HETs) were conducted on three soil gradations (Grade I-III) with different numbers of reinforcement rounds (0, 1, and 3), and Bacillus pasteurii was used to catalyze calcium carbonate precipitation. The results indicate that MICP markedly improves erosion resistance: (1) Reinforcement significantly reduces soil permeability and substantially increases the threshold for particle loss, such as the critical hydraulic gradient. (2) After three reinforcement rounds, the cumulative particle mass was reduced by 98.2% (Grade I), 97.5% (Grade II), and 94.3% (Grade III) relative to that of the untreated soils, delaying erosion by a factor of 2–3. (3) Scanning Electron Microscopy (SEM) revealed two cementation mechanisms—the effective cementation effect and the surface adhesion effect—that collectively reduced porosity via enhanced interparticle bonding. Particle gradation had a notable effect on the outcomes, with uniform soils (Grade II, uniformity coefficient = 5.23) attaining 8.09% calcium carbonate content after three rounds of reinforcement, surpassing heterogeneous gradations. This study presents MICP as a sustainable solution for erosion-prone infrastructure and advocates for hybrid biogeotechnical systems (e.g., MICP-vegetation composites) and real-time Electrical Resistivity Tomography (ERT) monitoring as essential strategies for scalable implementation.</p>

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Erosion Resistance Mechanisms in MICP-Treated Sandy Soil: Experimental Evaluation

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Yue Liang,
  • Lingling Weng,
  • Jintao Yu,
  • Jian Pan,
  • Bin Xu,
  • Hongjie Zhang,
  • Tiantian Yang

摘要

Internal erosion poses a substantial threat to geotechnical structures, including embankments and dams, with conventional stabilization methods often limited by environmental and economic constraints. This study examines the efficacy of Microbially Induced Calcite Precipitation (MICP) in enhancing the erosion resistance of sandy soils via controlled laboratory experiments. Upward seepage Hole Erosion Tests (HETs) were conducted on three soil gradations (Grade I-III) with different numbers of reinforcement rounds (0, 1, and 3), and Bacillus pasteurii was used to catalyze calcium carbonate precipitation. The results indicate that MICP markedly improves erosion resistance: (1) Reinforcement significantly reduces soil permeability and substantially increases the threshold for particle loss, such as the critical hydraulic gradient. (2) After three reinforcement rounds, the cumulative particle mass was reduced by 98.2% (Grade I), 97.5% (Grade II), and 94.3% (Grade III) relative to that of the untreated soils, delaying erosion by a factor of 2–3. (3) Scanning Electron Microscopy (SEM) revealed two cementation mechanisms—the effective cementation effect and the surface adhesion effect—that collectively reduced porosity via enhanced interparticle bonding. Particle gradation had a notable effect on the outcomes, with uniform soils (Grade II, uniformity coefficient = 5.23) attaining 8.09% calcium carbonate content after three rounds of reinforcement, surpassing heterogeneous gradations. This study presents MICP as a sustainable solution for erosion-prone infrastructure and advocates for hybrid biogeotechnical systems (e.g., MICP-vegetation composites) and real-time Electrical Resistivity Tomography (ERT) monitoring as essential strategies for scalable implementation.