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<p>Landslides pose a persistent and widespread hazard in mountainous regions, especially in areas with a history of ancient landslides that are prone to reactivation. The landslide at Paifang Pedestrian Street in Daguan County, Yunnan Province, China, exemplifies this risk due to its location atop an ancient landslide deposit, making it highly vulnerable during extreme weather events. This study employs the finite element method to simulate the coupled seepage-stress process, considering the effects of extreme rainfall, urban development, and geological conditions on slope stability. The findings indicate that increased rainfall intensity and duration significantly reduce the Factor of Safety (<i>FOS</i>). Under a peak rainfall of 140&#xa0;mm/day, the <i>FOS</i> decreases from 1.24 to 1.14 after 10 days. Furthermore, top loading and bottom unloading exacerbate slope instability, with the <i>FOS</i> dropping to 1.02 within four days under a loading pressure of 10,000&#xa0;Pa. After five days of rainfall, maximum unloading results in a displacement of 41.8&#xa0;mm and a critical <i>FOS</i> of 1.03. The presence of ancient sliding surfaces further compromises stability, with zones containing multiple sliding bands being particularly susceptible to reactivation. This study emphasizes the importance of incorporating both environmental and anthropogenic factors in landslide risk assessments and advocates for more comprehensive governance strategies that consider their combined effects.</p>

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Reactivation mechanisms of ancient landslide under the combined interactions of rainfall and top loading in Daguan County, Yunnan, China

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Hongwei Wang,
  • Yongbo Tie,
  • Yanfeng Zhang,
  • Chunshan Wang,
  • Lanpeng Sa,
  • Yanchao Gao,
  • Yongjian Bai,
  • Jingtao Liang,
  • Sainan Zhu,
  • Pei Tang

摘要

Landslides pose a persistent and widespread hazard in mountainous regions, especially in areas with a history of ancient landslides that are prone to reactivation. The landslide at Paifang Pedestrian Street in Daguan County, Yunnan Province, China, exemplifies this risk due to its location atop an ancient landslide deposit, making it highly vulnerable during extreme weather events. This study employs the finite element method to simulate the coupled seepage-stress process, considering the effects of extreme rainfall, urban development, and geological conditions on slope stability. The findings indicate that increased rainfall intensity and duration significantly reduce the Factor of Safety (FOS). Under a peak rainfall of 140 mm/day, the FOS decreases from 1.24 to 1.14 after 10 days. Furthermore, top loading and bottom unloading exacerbate slope instability, with the FOS dropping to 1.02 within four days under a loading pressure of 10,000 Pa. After five days of rainfall, maximum unloading results in a displacement of 41.8 mm and a critical FOS of 1.03. The presence of ancient sliding surfaces further compromises stability, with zones containing multiple sliding bands being particularly susceptible to reactivation. This study emphasizes the importance of incorporating both environmental and anthropogenic factors in landslide risk assessments and advocates for more comprehensive governance strategies that consider their combined effects.