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Centrifuge modeling of seismic response and failure mode of a slope reinforced by a pile-anchor structure

机译：桩锚结构加固边坡的地震反应及破坏模式的离心模型

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Pile-anchor structures are now widely used in major slope reinforcement projects, but research on the seismic response of slopes reinforced by these structures has been very limited. This paper presents the results of a series of 50g dynamic centrifuge tests that reproduce the seismic response of a slope reinforced by a pile-anchor structure exposed to an earthquake-induced stress field. A silica gel model of a slope is used to conduct multiple tests. Long-period wave amplitude amplification and frequency filtering are observed after spectral analysis. Pile bending moments and anchor tensions were recorded before the earthquake, at the moment of peak ground acceleration, and after the earthquake and the data show that the pile is the main load-bearing structure. The anchor aids in keeping the pile from tilting outward to improve the durability of the pile. Pile-anchor structure failure is caused by anchor relaxation, pile bending, and slope displacement after the passage of multiple seismic waves. A suggestion for pile-anchor structure design is provided. This paper provides a useful reference for future research on the interactions between support structures and a slope during and after earthquakes. The conclusions provided by these tests lay the foundation for designing pile-anchor reinforcement structures for better dynamic performance.
机译：桩锚结构现已广泛用于大型边坡加固工程​​中，但是对这些结构加固的边坡的地震反应的研究非常有限。本文介绍了一系列50g动态离心试验的结果，这些试验再现了由桩锚结构加固的边坡在地震引起的应力场中所产生的边坡的地震响应。使用斜率硅胶模型进行多次测试。频谱分析后观察到了长周期波幅放大和频率滤波。在地震发生前，地面加速度达到峰值时，地震发生后记录了桩的弯矩和锚固张力，数据表明桩是主要的承重结构。锚有助于防止桩向外倾斜，以提高桩的耐用性。多次地震波通过后，锚固松弛，桩体弯曲和边坡位移引起桩锚结构的破坏。提供了桩锚结构设计的建议。本文为地震期间和地震后支撑结构与边坡之间的相互作用提供了有益的参考。这些测试提供的结论为设计桩锚增强结构以提供更好的动力性能奠定了基础。

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