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<p>Analyzing the triggering mechanisms and evolution processes of reservoir-induced landslides is essential for assessing their stability and providing appropriate solutions for reservoir operators. This study focuses on the Darou (DR) landslide, which is a toppling paleo-landslide. We investigate the triggering mechanisms, deformation characteristics, and evolution of this landslide through detailed field investigations, borehole data, monitoring results, and optically stimulated luminescence (OSL) dating. The findings indicate that the DR landslide is a multistage toppling failure that occurred in the late Pleistocene. Its evolution process consists of four main stages: epigenetic reformation, time-dependent deformation, progressive deformation, and sliding failure. Before the impoundment, the landslide was predominantly creeping, except for the significant deformation caused by the Wenchuan earthquake 2008. However, after the impoundment, a strong deformation response occurred on its surface and subsurface. The maximum displacement is approximately 2310 mm on the ground and 890 mm underground. Moreover, some significant displacements below the deep sliding zone were monitored at In01, In02, and In08, with displacements of 50, 40, and 100 mm, respectively. Through integrated analysis, it was found that this phenomenon was closely related to the toppling residues. The findings in this study could provide some help in the design of reinforcements and management for toppling landslides under similar geological settings.</p>

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Reservoir impoundment induced the revival of toppling paleo-landslide in the upper reaches of the Yellow River: a case of Darou landslide

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Xiaolong Hu,
  • Nengpan Ju,
  • Jianjun Zhao,
  • Qianqian Feng,
  • Weihua Zhao,
  • Jian Huang,
  • Mingli Xie

摘要

Analyzing the triggering mechanisms and evolution processes of reservoir-induced landslides is essential for assessing their stability and providing appropriate solutions for reservoir operators. This study focuses on the Darou (DR) landslide, which is a toppling paleo-landslide. We investigate the triggering mechanisms, deformation characteristics, and evolution of this landslide through detailed field investigations, borehole data, monitoring results, and optically stimulated luminescence (OSL) dating. The findings indicate that the DR landslide is a multistage toppling failure that occurred in the late Pleistocene. Its evolution process consists of four main stages: epigenetic reformation, time-dependent deformation, progressive deformation, and sliding failure. Before the impoundment, the landslide was predominantly creeping, except for the significant deformation caused by the Wenchuan earthquake 2008. However, after the impoundment, a strong deformation response occurred on its surface and subsurface. The maximum displacement is approximately 2310 mm on the ground and 890 mm underground. Moreover, some significant displacements below the deep sliding zone were monitored at In01, In02, and In08, with displacements of 50, 40, and 100 mm, respectively. Through integrated analysis, it was found that this phenomenon was closely related to the toppling residues. The findings in this study could provide some help in the design of reinforcements and management for toppling landslides under similar geological settings.