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Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils

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Abstract

In recent years, the use of helical piles as a deep foundation option for structures has increased dramatically because they offer definite advantages over other solutions. The present study undertook a comprehensive investigation of the axial compressive behavior of helical piles in both sandy and clayey types of soil using finite element (FE) modeling. Since the helices of helical piles are more likely to disturb the soil adjacent to the pile, first some approaches are proposed to consider the effect of soil disturbance during a helical pile installation in numerical models. The numerical models have been validated and calibrated through full-scale compressive loading results using the ABAQUS software. The validated numerical models were used to investigate the load transfer mechanism of a typical helical pile in different types of sandy and clayey soil, and the numerically obtained ultimate bearing capacities were compared with the theoretical ones. Based on the comparison, it was found that the theoretical procedure overpredicts the ultimate capacity of helical piles in medium and dense sand. Additionally, different geometrical aspects of a typical helical pile were investigated using FE modeling in order to employ perfect geometry for studying the compressive behavior of a helical pile group with a square grid arrangement. The results revealed that the shape of the block failure mechanism in clayey soil differs from that in sandy soil. The acquired shapes are used to suggest a theoretical method for calculating the ultimate bearing capacity of a helical pile group based on the block failure mechanism.

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Authors and Affiliations

  1. Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

    Mohammadreza Jahanshahi Nowkandeh & Askar Janalizadeh Choobbasti

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  1. Mohammadreza Jahanshahi Nowkandeh
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  2. Askar Janalizadeh Choobbasti
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Correspondence to Mohammadreza Jahanshahi Nowkandeh.

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Nowkandeh, M.J., Choobbasti, A.J. Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils. Bull Eng Geol Environ 80, 4001–4023 (2021). https://doi.org/10.1007/s10064-021-02158-w

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  • DOI: https://doi.org/10.1007/s10064-021-02158-w

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