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<p>This study evaluates the geotechnical performance of conical helical piles under compressive and pullout loads, focusing on their application in marine structures. The research addresses the critical issue of soil disturbance, which can reduce bearing capacity, by examining the effects of the helix spacing-to-diameter ratio (<i>S</i>/<i>D</i>), soil density, and pile geometry. The study compares the behavior of typical and conical helical piles in loose and medium-dense sand through physical modeling via the Frustum Confining Vessel (FCV-AUT) as an effective tool for simulating field stress conditions and field testing. Results indicate that conical helical piles outperform typical ones, particularly under pullout loading. Reducing the <i>S</i>/<i>D</i> ratio from 3 to 1.5 increases the pullout capacity up to 15% for model and full-scale piles, respectively, while compressive capacity shows a reverse trend. Medium-dense sand enhances load capacity due to improved soil interlocking. Conical helical piles demonstrate higher pullout and compressive capacities, with improvements of up to 36%, respectively, compared to typical piles. The research highlights the importance of helix geometry and soil density in optimizing pile performance. These findings provide valuable insights for designing helical piles in marine environments, offering a more stable and efficient foundation solution.</p>

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Conical Helical Piles Behavior Assessment Through Physical Modeling and Field Testing

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Mostafa Nazmi,
  • Abolfazl Eslami

摘要

This study evaluates the geotechnical performance of conical helical piles under compressive and pullout loads, focusing on their application in marine structures. The research addresses the critical issue of soil disturbance, which can reduce bearing capacity, by examining the effects of the helix spacing-to-diameter ratio (S/D), soil density, and pile geometry. The study compares the behavior of typical and conical helical piles in loose and medium-dense sand through physical modeling via the Frustum Confining Vessel (FCV-AUT) as an effective tool for simulating field stress conditions and field testing. Results indicate that conical helical piles outperform typical ones, particularly under pullout loading. Reducing the S/D ratio from 3 to 1.5 increases the pullout capacity up to 15% for model and full-scale piles, respectively, while compressive capacity shows a reverse trend. Medium-dense sand enhances load capacity due to improved soil interlocking. Conical helical piles demonstrate higher pullout and compressive capacities, with improvements of up to 36%, respectively, compared to typical piles. The research highlights the importance of helix geometry and soil density in optimizing pile performance. These findings provide valuable insights for designing helical piles in marine environments, offering a more stable and efficient foundation solution.