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<p>To clarify the mechanism by which a sliding zone readily evolves at the interface of heterogeneous soil layers under rainfall conditions, this study takes a landslide in a weathered tuff formation as an example and analyzes the causative mechanism of sliding zone development at the interface between the completely weathered tuff layer and the overlying clayey layer. Firstly, the influence of component mixing on the physical and mechanical properties of the soil was quantitatively analyzed by preparing blended soils with different mixing ratios. Then, the in situ soil layer permeability and undisturbed soil strength were investigated. Finally, numerical analysis was employed to reveal the formation mechanism of the sliding zone evolving at the contact of heterogeneous soil layers under rainfall. The results show that mixing the completely weathered tuff soil with the overlying clayey layer leads to a rapid reduction in soil strength under high water content and facilitates the formation of a water-retaining barrier. The interface layer affects rainwater infiltration and groundwater distribution, making it more likely for excess pore water pressure to develop within the slope and causing a sharp drop in the factor of safety, which rapidly reduces the overall stability of the slope system.</p>

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Promotion of landslide evolution by mixing at interfaces of heterogeneous soil layers in sliding zone

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Jian Zhang,
  • Yihang Wu,
  • Yuke Ye,
  • Cong Chen,
  • Meiting Liao,
  • David Z. Zhu

摘要

To clarify the mechanism by which a sliding zone readily evolves at the interface of heterogeneous soil layers under rainfall conditions, this study takes a landslide in a weathered tuff formation as an example and analyzes the causative mechanism of sliding zone development at the interface between the completely weathered tuff layer and the overlying clayey layer. Firstly, the influence of component mixing on the physical and mechanical properties of the soil was quantitatively analyzed by preparing blended soils with different mixing ratios. Then, the in situ soil layer permeability and undisturbed soil strength were investigated. Finally, numerical analysis was employed to reveal the formation mechanism of the sliding zone evolving at the contact of heterogeneous soil layers under rainfall. The results show that mixing the completely weathered tuff soil with the overlying clayey layer leads to a rapid reduction in soil strength under high water content and facilitates the formation of a water-retaining barrier. The interface layer affects rainwater infiltration and groundwater distribution, making it more likely for excess pore water pressure to develop within the slope and causing a sharp drop in the factor of safety, which rapidly reduces the overall stability of the slope system.