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Deformation mechanisms and evolution of a pile-reinforced landslide under long-term reservoir operation

机译：长期储层运作下桩加筋滑坡的变形机制及演化

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Stabilizing piles are widely used for reinforcing landslides in the Three Gorges Reservoir area, China. Due to reservoir operations, long-term water-level fluctuations (WLFs) may cause instability or failure of the reservoir landslide and piles system (RLPS). This study experimentally investigated the deformation characteristics and mechanisms of the RLPS under long-term WLFs. The results showed that long-term WLFs led to loading and unloading cycles and consequently a weakening of the slope stability, where retrogressive failure and system instability were observed. Retrogressive failure at the slope toe was caused by topographical variation and physical and mechanical deterioration, which may be a result of the long-term WLFs. System instability was accompanied by a stress-release process above the new slip surface and was determined to be dependent on the geological structure of the RLPS. Based on this investigation, the evolution model of the pile-reinforced landslide under long-term WLFs was proposed. Even though the RLPS was adversely affected by the long-term WLFs, it maintained a relatively steady state due to the reinforcement of the piles. Effective pile installation changed the development of the reservoir landslides and prevented the entire slip surface from reaching a critical state. Thus, a catastrophic consequence was avoided, except for the local failure. Through physical modeling, this study experimentally provided a deeper understanding of the deformation mechanisms and evolution of the RLPS influenced by the long-term WLFs.
机译：稳定桩广泛用于加强中国三峡库区的山体滑坡。由于储层操作，长期水位波动（WLF）可能导致储层滑坡和桩系统（RLP）的不稳定或失效。本研究通过实验研究了在长期WLF下RLP的变形特征和机制。结果表明，长期WLF导致装载和卸载循环，从而削弱了斜坡稳定性，其中缩回故障和系统不稳定性被观察到。斜坡脚趾的倒退失效是由地形变异和物理和机械劣化引起的，这可能是长期WLF的结果。系统不稳定性伴随着新的滑动表面上方的应力释放过程，并确定依赖于RLP的地质结构。基于这一调查，提出了长期WLF下桩加筋滑坡进化模型。尽管RLP受到长期WLF的不利影响，但由于桩的加固，它保持了相对稳定的状态。有效的桩安装改变了储层滑坡的开发，并防止了整个滑动面达到了临界状态。因此，除了局部失败外，避免了灾难性的后果。通过物理建模，本研究实验地提供了对由长期WLF影响影响的RLP的变形机制和演化更深入地了解。

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