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On July 4, 2023, a complex translational landslide induced by extreme rainfall occurred in Wanzhou District, within the Three Gorges Reservoir Area, China. Approximately 460,000 m3 of soil and rock slid downslope, damaged residential buildings, rural roads, and cropland. Based on field investigations and aerial image interpretation, we conducted a comprehensive analysis of the causative factors of the landslide. According to its deformation features, the landslide was divided into three zones: (i) main sliding zone, (ii) potential sliding zones on the left and right flanks, and (iii) scraped and accumulation zone. The results indicate that the landslide was primarily controlled by intrinsic conditions, including the dip-slope topography and a softened, muddy weak interlayer within the shale strata. The immediate triggering factor was quick duration from extreme rainfall, while human activities acted as a secondary factor that exacerbated slope instability. These findings provide a scientific basis and new insights for the early identification, monitoring, early warning, and engineering mitigation of similar landslides in the region.

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Mechanisms of Rainfall-Induced Translational Landslide in Wanzhou District, Three Gorges Reservoir, China

  • 会议论文

  • 发表日期：

    2026年

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  • Kai Wang,
  • Kunlong Yin,
  • Deying Li,
  • Shuhao Liu,
  • Taorui Zeng,
  • Ye Li,
  • Qin Chen,
  • Binjing Jin,
  • Yang Liu

摘要

On July 4, 2023, a complex translational landslide induced by extreme rainfall occurred in Wanzhou District, within the Three Gorges Reservoir Area, China. Approximately 460,000 m3 of soil and rock slid downslope, damaged residential buildings, rural roads, and cropland. Based on field investigations and aerial image interpretation, we conducted a comprehensive analysis of the causative factors of the landslide. According to its deformation features, the landslide was divided into three zones: (i) main sliding zone, (ii) potential sliding zones on the left and right flanks, and (iii) scraped and accumulation zone. The results indicate that the landslide was primarily controlled by intrinsic conditions, including the dip-slope topography and a softened, muddy weak interlayer within the shale strata. The immediate triggering factor was quick duration from extreme rainfall, while human activities acted as a secondary factor that exacerbated slope instability. These findings provide a scientific basis and new insights for the early identification, monitoring, early warning, and engineering mitigation of similar landslides in the region.