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<p>This study explored Microbial-induced carbonate precipitation (MICP) technology to address the poor water stability and low cohesion of natural sandy loess, which is prone to geological hazards. Three calcium sources (calcium chloride, calcium acetate, calcium lactate) were used to treat small-scale samples under varying soaking durations. Results from disintegration, collapsibility, permeability, and strength tests revealed distinct performance differences. Calcium acetate-treated samples achieved an 86.7% reduction in disintegration after 7&#xa0;days, outperforming other calcium sources. Both calcium chloride and calcium acetate-treated samples reduced collapsibility by &gt; 90% within 3&#xa0;days. Permeability coefficients decreased by one order of magnitude after 3&#xa0;days and by 2 ~ 3 orders after 7&#xa0;days for calcium acetate and calcium lactate treated samples. However, the unconfined compressive strength (UCS) of MICP-treated samples remained only 72 ~ 88% of untreated samples post-treatment, attributed to structural disruption from excessive water during MICP application. While MICP significantly enhanced water stability, the process weakened intrinsic soil structure, leading to lower mechanical strength despite improved erosion resistance. These findings highlight MICP’s potential for mitigating sandy loess hazards but underscore the need to balance water stability enhancement with structural integrity preservation in practical applications.</p>

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Effect of MICP treatment on hydraulic characteristics of undisturbed sandy loess

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Chenchen Huang,
  • Qiang Du,
  • Liqiang Qu,
  • Jialin Xue

摘要

This study explored Microbial-induced carbonate precipitation (MICP) technology to address the poor water stability and low cohesion of natural sandy loess, which is prone to geological hazards. Three calcium sources (calcium chloride, calcium acetate, calcium lactate) were used to treat small-scale samples under varying soaking durations. Results from disintegration, collapsibility, permeability, and strength tests revealed distinct performance differences. Calcium acetate-treated samples achieved an 86.7% reduction in disintegration after 7 days, outperforming other calcium sources. Both calcium chloride and calcium acetate-treated samples reduced collapsibility by > 90% within 3 days. Permeability coefficients decreased by one order of magnitude after 3 days and by 2 ~ 3 orders after 7 days for calcium acetate and calcium lactate treated samples. However, the unconfined compressive strength (UCS) of MICP-treated samples remained only 72 ~ 88% of untreated samples post-treatment, attributed to structural disruption from excessive water during MICP application. While MICP significantly enhanced water stability, the process weakened intrinsic soil structure, leading to lower mechanical strength despite improved erosion resistance. These findings highlight MICP’s potential for mitigating sandy loess hazards but underscore the need to balance water stability enhancement with structural integrity preservation in practical applications.