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Seismic stability and failure mode of the slope containing a two-pile foundation

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Abstract

In this study, the seismic stability of the slope containing a two-pile foundation (SCTPF) under seismic loads is evaluated by the finite element limit analysis (FELA) method. The seismic loading is modeled as a statically applied inertial force, the magnitude of which is a product of a seismic coefficient and the weight of the potential sliding mass within the framework of the pseudo-static method. The feasibility of FELA in the analysis is validated by comparing the predicted safety factors, yield acceleration coefficients, and potential failure surfaces with those in published studies. On this basis, some non-dimensional multipliers are presented to investigate the variations of seismic safety factors with different factors and simplify the calculation of seismic safety factors. Numerous values of the multipliers under different conditions have been given in this study and the tendency of these multipliers with different factors has been explored by fitting curves or distribution regions. Furthermore, four detailed design tables for seismic safety factors and six representative slope failure modes are presented, with the mechanisms and conditions of these failure modes and the transitions among them elaborated.

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Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request (the data in the graph and the code of calculation, etc.).

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Acknowledgements

The authors are thankful to OptumCE for the free access of OptumG2 program (academic edition) to perform this study.

Funding

This research is part of work supported by grants from the National Natural Science Foundation of China (Nos. 52108317, 51978255, and 51908208) and the Hunan Provincial Natural Science Foundation of China (No. 2022JJ40074).

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Authors and Affiliations

  1. College of Civil Engineering, Hunan University, Changsha, 410082, People’s Republic of China

    Wenzhe Peng, Minghua Zhao, Heng Zhao & Chaowei Yang

  2. Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan University, Changsha, 410082, People’s Republic of China

    Wenzhe Peng, Minghua Zhao, Heng Zhao & Chaowei Yang

Authors
  1. Wenzhe Peng
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  2. Minghua Zhao
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  3. Heng Zhao
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  4. Chaowei Yang
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Corresponding author

Correspondence to Heng Zhao.

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Peng, W., Zhao, M., Zhao, H. et al. Seismic stability and failure mode of the slope containing a two-pile foundation. Bull Eng Geol Environ 82, 33 (2023). https://doi.org/10.1007/s10064-022-03039-6

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