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Displacement of Pile-Reinforced Slopes with a Weak Layer Subjected to Seismic Loads

机译：地震荷载作用下弱层桩加固边坡的位移

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摘要

The presence of a weak layer in a slope requires special attention because it has a negative impact on slope stability. However, limited insight into the seismic stability of slopes with a weak layer exists. In this study, the seismic stability of a pile-reinforced slope with a weak thin layer is investigated. Based on the limit analysis theory, a translational failure mechanism for an earth slope is developed. The rotational rigid blocks in the previous rotational-translational failure mechanism are replaced by continuous deformation regions, which consist of a sequence of.. rigid triangles. The predicted static factor of safety and collapse mechanism in two typical examples of slopes with a weak layer compare well with the results obtained from the available literature and by using the Discontinuity Layout Optimization (DLO) technique. The lateral forces provided by the stabilizing piles are evaluated using the theory of plastic deformation. An analytical solution for estimating the critical yield acceleration coefficient for the pile-reinforced slopes is derived. Based on the proposed translational failure mechanism and the corresponding critical yield acceleration coefficient, Newmark's analytical procedure isemployed to evaluate the cumulative displacement. Considering different real earthquake acceleration records as input motion, the effect of stabilizing piles and varying the spacing of piles on the cumulative displacement of slopes with a weak layer is investigated.
机译：需要特别注意的是斜坡中存在薄弱层，因为它会对斜坡稳定性产生负面影响。但是，对于具有薄弱层的斜坡的地震稳定性的认识有限。在这项研究中，研究了薄弱层桩加固边坡的地震稳定性。基于极限分析理论，建立了土坡平移破坏机理。先前的旋转-平移破坏机构中的旋转刚性块被连续变形区域代替，该连续变形区域由一系列刚性三角形组成。在两个典型的具有薄弱层的斜坡示例中，安全性和坍塌机制的预测静态因子与现有文献和使用非连续性布局优化（DLO）技术获得的结果相比较很好。稳定桩提供的侧向力使用塑性变形理论进行评估。推导了桩加固边坡临界屈服加速度系数的解析解。基于提出的平移破坏机理和相应的临界屈服加速度系数，采用Newmark的解析程序来评估累积位移。以不同的实际地震加速度记录作为输入运动，研究了稳定桩和改变桩距对弱层边坡累积位移的影响。

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  • 来源
    《Mathematical Problems in Engineering》 |2016年第9期|1527659.1-1527659.10|共10页
  • 作者

    Zhou Haizuo; Zheng Gang; Yang Xinyu; Diao Yu; Gong Lisen; Cheng Xuesong;

  • 作者单位

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China|Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China|Tianjin Univ, Key Lab Coast Civil Struct Safety, Minist Educ, Tianjin 300072, Peoples R China;

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