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<p>With the acceleration of industrialization, the effects of water pollution on soil are receiving increasing attention. To assess how polluting alkaline solutions affect the mechanical properties of loess, soil samples subjected to 10 freeze–thaw cycles and then contaminated with NaOH at various concentrations (0, 6, or 10%) were analyzed using direct shear tests, liquid and plastic limit assessments, nuclear magnetic resonance, and other tests. The results showed that as the alkali concentration increased, the soil’s peak failure strength under normal pressure, microstructure, and stability all improved. It was also observed that some soil particles dissolved and broke apart after immersion in the alkali solutions and that the number of pores sharply decreased but then steadily increased. After undergoing the freeze–thaw cycles, the pore content and pore size of the contaminated soil samples further increased, resulting in greater compressibility under vertical pressure. Additionally, the soil cohesion decreased, while the internal friction angle increased, and the liquid limit, plastic limit, and plasticity index all exhibited upward trends. Our findings provide valuable insights and serve as a reference for construction projects in seasonally frozen areas with alkaline contamination.</p>

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Effect of Alkali Pollution on the Failure Strength of Loess in Seasonally Frozen Soil under Shear Conditions

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Qianqian Ma,
  • Jinyang Tian,
  • Wanjun Ye,
  • Qiangbing Huang,
  • Zhiyuan Xu,
  • Jiahao Wang,
  • Tengfei Guo

摘要

With the acceleration of industrialization, the effects of water pollution on soil are receiving increasing attention. To assess how polluting alkaline solutions affect the mechanical properties of loess, soil samples subjected to 10 freeze–thaw cycles and then contaminated with NaOH at various concentrations (0, 6, or 10%) were analyzed using direct shear tests, liquid and plastic limit assessments, nuclear magnetic resonance, and other tests. The results showed that as the alkali concentration increased, the soil’s peak failure strength under normal pressure, microstructure, and stability all improved. It was also observed that some soil particles dissolved and broke apart after immersion in the alkali solutions and that the number of pores sharply decreased but then steadily increased. After undergoing the freeze–thaw cycles, the pore content and pore size of the contaminated soil samples further increased, resulting in greater compressibility under vertical pressure. Additionally, the soil cohesion decreased, while the internal friction angle increased, and the liquid limit, plastic limit, and plasticity index all exhibited upward trends. Our findings provide valuable insights and serve as a reference for construction projects in seasonally frozen areas with alkaline contamination.