Geomechanics and Engineering

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CPT-based dynamic p-y analysis method for seismic design of piles embedded in clay

  • Garam Kim (Research Institute of Korea Electric Power Corporation) ;
  • Jiyeong Lee (School of Civil and Environmental Engineering, Yonsei University) ;
  • Jonghyeog Yoon (School of Civil and Environmental Engineering, Yonsei University) ;
  • Qaisar Abbas (School of Civil and Environmental Engineering, Yonsei University) ;
  • Junhwan Lee (School of Civil and Environmental Engineering, Yonsei University)
  • Received : 2022.03.01
  • Accepted : 2023.10.24
  • Published : 2023.11.10
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Abstract

In this study, a dynamic p-y curve method for the seismic design of laterally loaded pile in clay was proposed focusing on the direct application of the cone penetration test (CPT) result. Key motivation of this study was to fully utilize the continuous and in-situ profiling capability of CPT, which was particularly effective for multi-layered, heterogeneous soil conditions and offshore environment. The exerted dynamic load response of pile was expressed and obtained by introducing the static stiffness and damping of clay into the dynamic p-y curve function, both formulated as a function of the cone resistance. The proposed CPT-based dynamic p-y curve function was employed in the pseudo-static analysis based on an equivalent static-load approach. A calculation algorithm was prepared to implement the proposed method, following the procedure of the pseudo-static analysis. Case examples were selected, including centrifuge tests and field load tests, and adopted to compare measured and predicted dynamic pile load responses. The compared results of the case examples confirmed that the proposed method was effective and beneficial for the seismic design of piles in clay.

Keywords

Acknowledgement

This research was conducted with the support of the "National R&D Project for Smart Construction Technology (No. RS-2020-KA156488)" funded by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport, and managed by the Korea Expressway Corporation. It was also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (No. 2020R1A2C201196614).

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