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<p>Screw piles have been widely used in engineering practice. The tapered full-screw pile (TS pile) is a special type of screw pile, characterized by continuous threads and a linearly varying diameter. It offers advantages such as convenient construction and enhanced load-bearing capacity. To investigate the horizontal bearing characteristics and pile–soil interaction of the TS pile, a series of transparent soil model tests were conducted in this study. The differences in bearing performance and displacement fields among TS piles, tapered piles, and constant section piles under horizontal loading were systematically compared. This study employed split-type 3D-printed model piles and integrated a measurement system combining traditional displacement and strain sensors with a multi-laser and multi-camera particle image velocimetry (PIV) system. Comprehensive analyses were conducted, including load–displacement responses, lateral displacements, bending moments, <i>p–y</i> curves, soil deformation around screw piles, and front and top face displacements. Results demonstrate that the threaded-tapered geometry of TS piles improves performance through three primary mechanisms: enlarged pile–soil contact area, enhanced overall stiffness, and altered soil particle movement induced by mechanical interlocking. TS piles exhibited 38.9 and 46.7% higher unit-volume bearing capacities than tapered and constant section piles, respectively, while reducing the extent of vertical and horizontal soil displacement zones by at least 50%. These findings offer insights into TS pile behavior under horizontal loading and suggest potential engineering implications for their future application in complex geotechnical environments.</p>

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Experimental study on the horizontal bearing performance of precast tapered full-screw pile in transparent soil

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Geng Chen,
  • Xuanming Ding,
  • Chunyan Wang,
  • Lingzhi Zhang,
  • Dingxin Zhang

摘要

Screw piles have been widely used in engineering practice. The tapered full-screw pile (TS pile) is a special type of screw pile, characterized by continuous threads and a linearly varying diameter. It offers advantages such as convenient construction and enhanced load-bearing capacity. To investigate the horizontal bearing characteristics and pile–soil interaction of the TS pile, a series of transparent soil model tests were conducted in this study. The differences in bearing performance and displacement fields among TS piles, tapered piles, and constant section piles under horizontal loading were systematically compared. This study employed split-type 3D-printed model piles and integrated a measurement system combining traditional displacement and strain sensors with a multi-laser and multi-camera particle image velocimetry (PIV) system. Comprehensive analyses were conducted, including load–displacement responses, lateral displacements, bending moments, p–y curves, soil deformation around screw piles, and front and top face displacements. Results demonstrate that the threaded-tapered geometry of TS piles improves performance through three primary mechanisms: enlarged pile–soil contact area, enhanced overall stiffness, and altered soil particle movement induced by mechanical interlocking. TS piles exhibited 38.9 and 46.7% higher unit-volume bearing capacities than tapered and constant section piles, respectively, while reducing the extent of vertical and horizontal soil displacement zones by at least 50%. These findings offer insights into TS pile behavior under horizontal loading and suggest potential engineering implications for their future application in complex geotechnical environments.