Abstract
This paper investigated and compared the dynamic responses of driven and helical piles in cohesive soil using finite element analysis. The finite element models were calibrated based on large-scale field dynamic tests on single steel piles driven into a soft clay layer and embedded in a gravelly sand layer. The soft clay was improved using the cement deep soil mixing technique. The calculated results from the numerical models were in good agreement with the measured response in the field tests. The numerical models were then employed to investigate the dynamic response of helical piles in clay. Driven steel piles and single- and double-helix piles were subjected to lateral dynamic loads, and their responses were compared. The results demonstrated that the helical pile exhibited excellent lateral and axial responses, comparable to that of the driven piles. The lateral displacement of the helical piles was similar to or less than that of longer driven piles depending on the clay strength, number, and spacing of the helices. In addition, the double-helix pile with an inter-helix spacing of 3 times the helix diameter reduced the required width of soil treatment to 7.5 times the pile diameter while achieving the same performance as a driven pile with a treated area 12 times the pile diameter. The kinematic and inertial interaction effects were evaluated for helical piles. It was found that the kinematic interaction forces increased the bending moment at the interface of different layers, while the inertial forces increased the bending moment at the ground level. Finally, the helical pile exhibited lower lateral deformations than the driven pile during the seismic motion, and the maximum bending moment was relatively lower.
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Abbreviations
- CDSM:
-
Cement deep soil mixing
- SPSI:
-
Soil–pile–superstructure interaction
- FEA:
-
Finite element analysis
- FDA:
-
Finite difference analysis
- PGA:
-
Peak ground acceleration
- SHPSI:
-
Soil–helical pile–superstructure interaction
- BNWF:
-
Beam on nonlinear Winkler foundation
- EI:
-
Stiffness
- E :
-
Elasticity
- D :
-
Pipe pile outer diameter
- D helix :
-
Helix diameter
- 3D:
-
Three-dimensional
- SHP:
-
Single-helix pile
- DHP:
-
Double-helix pile
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AFH did conceptualization, methodology, investigation, resources, numerical analysis, validation, data curation, writing—original draft. MHEN performed supervision, conceptualization, methodology, resources, writing—review and editing.
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Hussein, A.F., El Naggar, M.H. Dynamic performance of driven and helical piles in cohesive soil. Acta Geotech. 18, 1543–1568 (2023). https://doi.org/10.1007/s11440-022-01649-8
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DOI: https://doi.org/10.1007/s11440-022-01649-8