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<p>This study aims to investigates the bearing performance and load-transfer mechanism of screw piles, a novel pile type featuring screws along the shaft. A series of model tests were conducted on single screw pile to examine the effects of pile type (straight vs. screw), screw pitch, plate width, and surrounding soil type on vertical bearing behavior. Furthermore, a three-dimensional finite element model was developed to analyze the influence of screw design parameters and soil properties on the bearing performance. The results indicate that: (1) screw piles exhibit significantly higher ultimate bearing capacity and material utilization efficiency compared to straight piles; (2) among the screw design parameters, screw pitch and screw width are the primary factors affecting bearing capacity, whereas screw thickness has negligible influence; (3) the lateral bearing capacity is mainly derived from soil shear resistance, with an optimal screw pitch existing to maximize ultimate capacity; (4) in practice, excessive screw thickness can lead to insufficient structural strength and complicate construction. This study provides insights and a basis for the design and mechanistic analysis of screw piles.</p>

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Bearing Performance and Mechanism of Screw Pile: Model Test and Numerical Analysis

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Yafeng Li,
  • Anyu Chen,
  • Junli Dong,
  • Haibing Cai,
  • Shouzhong Feng,
  • Qishu Zhang,
  • Xifei Deng,
  • Shenghua Jiang

摘要

This study aims to investigates the bearing performance and load-transfer mechanism of screw piles, a novel pile type featuring screws along the shaft. A series of model tests were conducted on single screw pile to examine the effects of pile type (straight vs. screw), screw pitch, plate width, and surrounding soil type on vertical bearing behavior. Furthermore, a three-dimensional finite element model was developed to analyze the influence of screw design parameters and soil properties on the bearing performance. The results indicate that: (1) screw piles exhibit significantly higher ultimate bearing capacity and material utilization efficiency compared to straight piles; (2) among the screw design parameters, screw pitch and screw width are the primary factors affecting bearing capacity, whereas screw thickness has negligible influence; (3) the lateral bearing capacity is mainly derived from soil shear resistance, with an optimal screw pitch existing to maximize ultimate capacity; (4) in practice, excessive screw thickness can lead to insufficient structural strength and complicate construction. This study provides insights and a basis for the design and mechanistic analysis of screw piles.