Geomechanics and Engineering

  • 제31권5호
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  • Pages.505-518
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR Code

Modified p-y curves to characterize the lateral behavior of helical piles

  • Hyeong-Joo, Kim (Department of Civil Engineering, Kunsan National University) ;
  • James Vincent, Reyes (Department of Civil and Environmental Engineering, Kunsan National University) ;
  • Peter Rey, Dinoy (Department of Civil and Environmental Engineering, Kunsan National University) ;
  • Tae-Woong, Park (Renewable Energy Research Institute, Kunsan National University) ;
  • Hyeong-Soo, Kim (Department of Civil and Environmental Engineering, Kunsan National University) ;
  • Jun-Young, Kim (Department of Civil and Environmental Engineering, Kunsan National University)
  • 투고 : 2021.08.26
  • 심사 : 2022.11.24
  • 발행 : 2022.12.10
⟨ 이전 논문 다음 논문 ⟩

초록

This study introduces soil resistance multipliers at locations encompassed by the zone of influence of the helix plate to consider the added lateral resistance provided to the helical pile. The zone of influence of a helix plate is a function of its diameter and serves as a boundary condition for the modified soil resistance springs. The concept is based on implementing p-multipliers as a reduction factor for piles in group action. The application of modified p-y springs in the analysis of helical piles allows for better characterization and understanding of the lateral behavior of helical piles, which will help further the development of design methods. To execute the proposed method, a finite difference program, HPCap (Helical Pile Capacity), was developed by the authors using Matlab. The program computes the deflection, shear force, bending moment, and soil resistance of the helical pile and allows the user to freely input the value of the zone of influence and Ω (a coefficient that affects the value of the p-multiplier). Results from ten full-scale lateral load tests on helical piles embedded at depths of 3.0 m with varying shaft diameters, shaft thicknesses, and helix configurations were analyzed to determine the zone of influence and the magnitude of the p-multipliers. The analysis determined that the value of the p-multipliers is influenced by the ratio between the pile embedment length and the shaft diameter (Dp), the effective helix diameter (Dh-Dp), and the zone of influence. Furthermore, the zone of influence is recommended to be 1.75 times the helix diameter (Dh). Using the numerical analysis method presented in this study, the predicted deflections of the various helical pile cases showed good agreement with the observed field test results.

키워드

과제정보

The research presented by this paper was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF). Funded by the Ministry of Education (NRF2021R1A6A1A1A0304518511, NRF2020R1I1A3A04036506).

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