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<p>Giant ancient landslides within active fault zones pose a recurrent threat due to their potential for reactivation. However, the post-remediation behavior of such landslides and the actual performance of their supporting structures remain poorly understood, owing to a lack of long-term and comprehensive field evidence. Focusing on the Jiangdingya landslide on the northeastern margin of the Tibetan Plateau, this study employs an integrated approach combining multi-source monitoring (SBAS-InSAR, geophysical surveys, deep displacement, pore-water pressure, and pile internal force measurements) with 3D numerical simulation to reveal the landslide’s post-remediation deformation mechanisms and structural behavior. The landslide is fault-controlled, characterized by a multi-level sliding surface system and heterogeneous aquifer. Its stability degrades nonlinearly with rainfall intensity due to progressive hydraulic weakening, whereas seismic disturbances induce transient inertial responses. Monitoring shows that anti-slide piles exhibit multi-peak bending moment distributions, corresponding to load transfer from multiple sliding surfaces. The tensile stress in central rebars can reach up to 2.4 times that in corner rebars, revealing a pronounced shear lag effect. This suggests that the classical plane-section assumption may no longer be applicable for large rectangular piles under such complex distributed loading. By integrating multi-scale monitoring with simulation, this work systematically elucidates the coupled mechanisms linking surface deformation, hydrological response, and structural internal forces, providing valuable field evidence for the mechanical behavior of large-diameter piles in multi-slip-surface landslides and offering new insights for slope support design in complex tectonic settings.</p>

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Reactivation of ancient landslides in complex tectonic settings: Insights from the long-term monitoring of Jiangdingya landslides on the northeastern Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Yang Xiaohui,
  • Zhu Wenjie,
  • Liu Xiaojie,
  • Guo Nan,
  • Xu Shuai,
  • Hao Junming

摘要

Giant ancient landslides within active fault zones pose a recurrent threat due to their potential for reactivation. However, the post-remediation behavior of such landslides and the actual performance of their supporting structures remain poorly understood, owing to a lack of long-term and comprehensive field evidence. Focusing on the Jiangdingya landslide on the northeastern margin of the Tibetan Plateau, this study employs an integrated approach combining multi-source monitoring (SBAS-InSAR, geophysical surveys, deep displacement, pore-water pressure, and pile internal force measurements) with 3D numerical simulation to reveal the landslide’s post-remediation deformation mechanisms and structural behavior. The landslide is fault-controlled, characterized by a multi-level sliding surface system and heterogeneous aquifer. Its stability degrades nonlinearly with rainfall intensity due to progressive hydraulic weakening, whereas seismic disturbances induce transient inertial responses. Monitoring shows that anti-slide piles exhibit multi-peak bending moment distributions, corresponding to load transfer from multiple sliding surfaces. The tensile stress in central rebars can reach up to 2.4 times that in corner rebars, revealing a pronounced shear lag effect. This suggests that the classical plane-section assumption may no longer be applicable for large rectangular piles under such complex distributed loading. By integrating multi-scale monitoring with simulation, this work systematically elucidates the coupled mechanisms linking surface deformation, hydrological response, and structural internal forces, providing valuable field evidence for the mechanical behavior of large-diameter piles in multi-slip-surface landslides and offering new insights for slope support design in complex tectonic settings.