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<p>The frequent occurrence of landslides brought on by rainfall in an area significantly hamper the development of the region. As the damage caused by landslides in loess is closely related to friction, research into the friction properties of loess is of great significance. In this study, tribological experiments were conducted on loess with different moisture contents (5, 10, 15%, 20, 25) and particle sizes (1–2&#xa0;mm, 0.5–1&#xa0;mm, 0.1–0.5&#xa0;mm, and &lt; 0.1&#xa0;mm) at varying sliding rates. The results show that both the static and dynamic friction coefficients of loess increase with rising water content. When the water content approaches 25%, the static friction coefficients of the four particle-size groups exhibit a positive correlation with grain size. However, as water content continues to increase, the influence of particle size on friction gradually diminishes. As water content rises from 5 to 25%, the friction–time curve shifts from an almost flat and stable trend to one characterized by pronounced peaks that progressively intensify. Based on these variations, interfacial friction can be divided into three stages: rolling friction, sliding friction, and stick–slip friction. This study provides a dynamic mechanistic reference for understanding both loess landslide hazards and interfacial friction behavior.</p>

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Experimental Investigation of Frictional Behaviour of Loess Interfaces under Varying Moisture Conditions

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Jikun Wang,
  • Qiang Sun,
  • Shihao Yuan,
  • Honghao Yuan,
  • Yuan Xin,
  • Qianyang He

摘要

The frequent occurrence of landslides brought on by rainfall in an area significantly hamper the development of the region. As the damage caused by landslides in loess is closely related to friction, research into the friction properties of loess is of great significance. In this study, tribological experiments were conducted on loess with different moisture contents (5, 10, 15%, 20, 25) and particle sizes (1–2 mm, 0.5–1 mm, 0.1–0.5 mm, and < 0.1 mm) at varying sliding rates. The results show that both the static and dynamic friction coefficients of loess increase with rising water content. When the water content approaches 25%, the static friction coefficients of the four particle-size groups exhibit a positive correlation with grain size. However, as water content continues to increase, the influence of particle size on friction gradually diminishes. As water content rises from 5 to 25%, the friction–time curve shifts from an almost flat and stable trend to one characterized by pronounced peaks that progressively intensify. Based on these variations, interfacial friction can be divided into three stages: rolling friction, sliding friction, and stick–slip friction. This study provides a dynamic mechanistic reference for understanding both loess landslide hazards and interfacial friction behavior.