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<p>Considering the economic and environmental advantages of using helical piles and the limited number of field load tests, examining the performance and load-bearing capacity of helical pile components is highly beneficial. The objective of this study is to investigate the load–displacement behavior of helical piles using FCV physical modeling and to determine the load-bearing capacity of the pile tip, blades, and shaft through novel instrumentation. For this purpose, axial compression loading tests were conducted on samples of moist sand with 4% moisture content in a physical modeling apparatus with a relative density of 40–45%, under pressures of 100 and 200&#xa0;kPa, and with different blade diameters (D = 90, D = 70, and D = 60&#xa0;mm). By examining the slope of load–displacement changes (dQ/dρ) in the load–displacement curves of helical piles, it was observed that this ratio varies with changes in blade diameter and pile height at a constant relative density. The behavior of the load–displacement curves transitions from nearly linear to nonlinear as the blade diameter increases. Analysis of the load–displacement curves of the instrumented piles showed that the overall slope of the load–displacement curves follows the slope of blade loading, particularly the bottom blade, and the load-bearing capacity of the bottom blade is more pronounced compared to the top blade.</p>

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Investigation of the Load–Displacement Behavior of Helical Piles in Sand Through Novel Instrumentation

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Ali Akbari Zare,
  • Abolfazl Eslami,
  • Arash Razmkhah,
  • Hamidreza Vosoughifar

摘要

Considering the economic and environmental advantages of using helical piles and the limited number of field load tests, examining the performance and load-bearing capacity of helical pile components is highly beneficial. The objective of this study is to investigate the load–displacement behavior of helical piles using FCV physical modeling and to determine the load-bearing capacity of the pile tip, blades, and shaft through novel instrumentation. For this purpose, axial compression loading tests were conducted on samples of moist sand with 4% moisture content in a physical modeling apparatus with a relative density of 40–45%, under pressures of 100 and 200 kPa, and with different blade diameters (D = 90, D = 70, and D = 60 mm). By examining the slope of load–displacement changes (dQ/dρ) in the load–displacement curves of helical piles, it was observed that this ratio varies with changes in blade diameter and pile height at a constant relative density. The behavior of the load–displacement curves transitions from nearly linear to nonlinear as the blade diameter increases. Analysis of the load–displacement curves of the instrumented piles showed that the overall slope of the load–displacement curves follows the slope of blade loading, particularly the bottom blade, and the load-bearing capacity of the bottom blade is more pronounced compared to the top blade.