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<p>This study investigated the role of enzyme-induced carbonate precipitation (EICP) in enhancing the erosion resistance and hydro-mechanical stability of slope soils under intense rainfall conditions. Laboratory tests were performed to characterize the geotechnical behavior of untreated and EICP-treated soils, followed by rainfall model tests to evaluate slope response and failure characteristics. It can be concluded that EICP treatment significantly increased soil strength while reducing hydraulic conductivity, thereby improving the resistance of the slope surface to rainfall erosion. In rainfall model tests, EICP treatment reduced soil loss by approximately 51%, while the surface strength increased by two- to threefold, and calcium carbonate content increased by four- to sixfold, compared with untreated slopes. Microstructural and mineralogical analyses revealed that calcium carbonate precipitation promoted pore filling, particle bridging, and interparticle bonding, leading to a more stable soil skeleton and enhanced resistance to rainfall-induced deterioration. These findings demonstrate that EICP provides an effective bio-mediated stabilization strategy for mitigating rainfall-triggered slope degradation in tropical mountainous regions.</p>

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Mitigation of Rainfall-Induced Slope Erosion and Instability Using Enzyme-Induced Carbonate Precipitation

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Soe Hlaing Tun,
  • Changnv Zeng

摘要

This study investigated the role of enzyme-induced carbonate precipitation (EICP) in enhancing the erosion resistance and hydro-mechanical stability of slope soils under intense rainfall conditions. Laboratory tests were performed to characterize the geotechnical behavior of untreated and EICP-treated soils, followed by rainfall model tests to evaluate slope response and failure characteristics. It can be concluded that EICP treatment significantly increased soil strength while reducing hydraulic conductivity, thereby improving the resistance of the slope surface to rainfall erosion. In rainfall model tests, EICP treatment reduced soil loss by approximately 51%, while the surface strength increased by two- to threefold, and calcium carbonate content increased by four- to sixfold, compared with untreated slopes. Microstructural and mineralogical analyses revealed that calcium carbonate precipitation promoted pore filling, particle bridging, and interparticle bonding, leading to a more stable soil skeleton and enhanced resistance to rainfall-induced deterioration. These findings demonstrate that EICP provides an effective bio-mediated stabilization strategy for mitigating rainfall-triggered slope degradation in tropical mountainous regions.