فهرست نشریات علمی دسترسی آزاد ایران

This experimental study examined the axial performance of helical piles subjected to compressive and tensile loads, with a particular focus on the effects of helix spacing, number of helices, soil compaction, and loading type. Employing a large-scale frustum-confining vessel (AUT-FCV) to accurately simulate in-situ stress conditions, the behavior of single- and double-helix piles was analyzed in medium- and low-density sandy soils. The findings revealed that soil compaction significantly enhanced pile performance, with medium-dense soils markedly increasing both the compressive and tensile capacities. Optimal performance was observed in double-helix piles with a helix spacing of 1.5 times the diameter, which demonstrated an improved load-bearing capacity and reduced displacement. Notably, in well-compacted soils, the tensile bearing capacity approached or equaled the compressive capacity, underscoring the suitability of helical piles for uplift-resisting applications in such conditions. These results contribute to the advancement of more effective design methodologies for helical pile foundations in sandy soils, particularly in coastal and urban geotechnical contexts.