Abstract Anti-slide piles are widely used for stabilizing landslides and a large number of landslide-piles systems were constituted in reservoir areas. How these landslide-piles systems evolve under reservoir effects is vital for the safe operation of dams. In this study, two reservoir conditions, namely condition of static water level and water level fluctuations, were considered for detailly exploring the influence of static and dynamic water pressure on a landslide-piles system in physical model tests. The pore water pressure, surface deformation and photographs of visual observations were obtained for comparatively analyzing the deformation characteristic and failure mechanism of landslide-piles models under the two conditions. The results show that the soil deformation and failure around the piles were similar in the two tests due to the same pile arrangements. However, retrogressive deformation and two soil collapses occurred in the landslide front area under water level fluctuations instead of slight deformation and shallow erosion under the static water level. The outward hydrodynamic pressure caused by reservoir drawdowns was the primary reason for the soil collapses in the landslide front area. The progressively intensified deformation around the piles which indirectly decreased the soil stability in the landslide front area was the secondary cause for the collapses. The Majiagou landslide-piles system in the field was identified as in the early period of the uniform deformation stage at present based on the field observations, monitoring data and the test results under water level fluctuations.

中文翻译：

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两种不同储层条件下桩基滑坡演化过程及破坏机理模型试验

摘要 抗滑桩广泛用于稳定滑坡，库区建设了大量的滑坡桩系统。这些滑坡桩系统如何在水库效应下演变对于大坝的安全运行至关重要。本研究考虑静水位和水位波动两种水库条件，在物理模型试验中详细探讨静、动水压对滑坡桩系统的影响。获得孔隙水压力、地表变形和目视观察照片，对比分析两种条件下滑坡桩模型的变形特征和破坏机制。结果表明，由于相同的桩布置，两次试验中桩周围土体的变形和破坏相似。然而，在水位波动下滑坡前缘区域发生了倒退变形和两次土体坍塌，而不是在静水位下发生轻微变形和浅层侵蚀。水库水位下降引起的向外的水动力压力是滑坡前缘土壤塌陷的主要原因。桩身周围逐渐加剧的变形间接降低了滑坡前缘土壤的稳定性，是造成坍塌的次要原因。根据现场观测，目前马家沟滑坡桩系统处于均匀变形阶段早期，