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Dynamic limit equilibrium analysis of sliding block for rock slope based on nonlinear FEM

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Abstract

Traditional rigid body limit equilibrium method (RBLEM) was adopted for the stability evaluation and analysis of rock slope under earthquake scenario. It is not able to provide the real stress distribution of the structure, while the strength reduction method relies on the arbitrary decision on the failure criteria. The dynamic limit equilibrium solution was proposed for the stability analysis of sliding block based on 3-D multi-grid method, by incorporating implicit stepping integration FEM. There are two independent meshes created in the analysis: One original 3-D FEM mesh is for the simulation of target structure and provides the stress time-history, while the other surface grid is for the simulation of sliding surface and could be selected and designed freely. As long as the stress time-history of the geotechnical structure under earthquake scenario is obtained based on 3-D nonlinear dynamic FEM analysis, the time-history of the force on sliding surface could be derived by projecting the stress time-history from 3-D FEM mesh to surface grid. After that, the safety factor time-history of the sliding block will be determined through applying limit equilibrium method. With those information in place, the structure’s aseismatic stability can be further studied. The above theory and method were also applied to the aseismatic stability analysis of Dagangshan arch dam’s right bank high slope and compared with the the result generated by Quasi-static method. The comparative analysis reveals that the method not only raises the FEM’s capability in accurate simulation of complicated geologic structure, but also increases the flexibility and comprehensiveness of limit equilibrium method. This method is reliable and recommended for further application in other real geotechnical engineering.

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Authors and Affiliations

  1. State Key Laboratory of Hydroscience and Engineering (Tsinghua University), Beijing, 100084, China

    Yao-ru Liu  (刘相儒), Zhu He  (何柱), Kuang-dai Leng  (冷旷代), Yue-qun Huang  (黄跃群) & Qiang Yang  (杨强)

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  1. Yao-ru Liu  (刘相儒)
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  2. Zhu He  (何柱)
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  3. Kuang-dai Leng  (冷旷代)
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  4. Yue-qun Huang  (黄跃群)
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  5. Qiang Yang  (杨强)
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Correspondence to Yao-ru Liu  (刘相儒).

Additional information

Foundation item: Project(2013-KY-2) supported by the State Key Laboratory of Hydroscience and Engineering of Hydroscience, China; Project(50925931) supported by the National Funds for Distinguished Young Scientists, China

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Liu, Yr., He, Z., Leng, Kd. et al. Dynamic limit equilibrium analysis of sliding block for rock slope based on nonlinear FEM. J. Cent. South Univ. 20, 2263–2274 (2013). https://doi.org/10.1007/s11771-013-1733-2

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  • DOI: https://doi.org/10.1007/s11771-013-1733-2

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