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Investigation on seismic response of a three-stage soil slope supported by anchor frame structure

锚杆框架结构支护三级边坡的地震响应特性研究

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Abstract

Based on a typical prototype of a soil slope in engineering practice, a numerical model of a three-stage soil slope supported by the anchor frame structure was established by means of FLAC3D code. The dynamic responses of three-stage soil slope and frame structure were studied by performing a series of bidirectional Wenchuan motions in terms of the failure mode of three-stage structure, the acceleration of soil slope, the displacement of frame structure, and the anchor stress of frame structure. The response accelerations in both horizontal and vertical directions are the most largely amplified at the slope top of each stage subjected to different shaking cases. The platforms among the stages reduce the amplification effect of response acceleration. The residual displacement of frame structure increases significantly as the intensity of shaking case increases. The frame structure at each stage presents a combined displacement mode consisting of a translation and a rotation around the vertex. The anchor stress of frame structure is mainly increased by the first intense pulse of Wenchuan seismic wave, and it is sensitive to the intensity of shaking case. The anchor stress of frame structure at the first stage is the most considerably enlarged by earthquake loading.

摘要:

结合某工程实践中的典型边坡原型,基于FLAC3D 代码建立了锚杆框架结构支护三级土坡的数 值模型。 通过施加一系列双向汶川地震动激励, 研究三级土坡和锚杆框架结构的动力响应,获得了三 级结构的破坏状态、土坡的加速度响应、框架结构的位移响应以及锚杆轴向应力。 在不同的激励工况 下, 每级边坡顶面的水平和垂直加速度响应均最大。 各级土坡间设置的平台减少了加速度响应的放大 效应。 随着地震动强度的增加, 框架结构的地震残余位移显著增加。 每一级框架结构呈现出平移及绕 顶部旋转的组合位移模式。 框架结构的锚杆轴向应力在汶川地震动激励的第一个振动强烈时段显著增 加, 且对地震动强度敏感。 地震荷载作用下第一级框架结构的锚杆轴向应力增幅最为显著。

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Yu-liang Lin  (林宇亮), Ying-xin Li  (李英鑫) & Lian-heng Zhao  (赵炼恒)

  2. Department of Civil Engineering, The University of British Columbia, Vancouver, V6T 1Z4, Canada

    Yu-liang Lin  (林宇亮) & T Y Yang

  3. Key Laboratory of Engineering Structures of Heavy Haul Railway of Ministry of Education, Central South University, Changsha, 410075, China

    Yu-liang Lin  (林宇亮)

  4. International Joint Research Laboratory of Earthquake Engineering, Tongji University, Shanghai, 200092, China

    T Y Yang

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  1. Yu-liang Lin  (林宇亮)
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  2. Ying-xin Li  (李英鑫)
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  3. Lian-heng Zhao  (赵炼恒)
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Correspondence to Yu-liang Lin  (林宇亮) or Lian-heng Zhao  (赵炼恒).

Additional information

Foundation item: Projects(51878667, 51678571) supported by the National Natural Science Foundation of China; Project(2018zzts657) supported by the Central South University Postgraduates’ Innovation, China; Project(2018JJ2517) supported by the Hunan Provincial Natural Science Foundation of China

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Lin, Yl., Li, Yx., Zhao, Lh. et al. Investigation on seismic response of a three-stage soil slope supported by anchor frame structure. J. Cent. South Univ. 27, 1290–1305 (2020). https://doi.org/10.1007/s11771-020-4367-1

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