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Volume Title: ICASGE2023

DOI: ICASGE-GEO

¹Mona Fawzy Al Daghma ; ²Hisham Abdel-Mohsen; ²Ahmed Abdulaziz; Mona Fawzy Al Daghma

¹Construction Engineering and management Department, Faculty of Engineering, Pharos University, Alexandria, Egypt

²Structural Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt.

Helical piles are currently gaining popularity as an efficient foundation option for quiet and rapid installation. The behavior of these piles under the action of vertical or horizontal loads has already been studied by many researchers. However, there is a lack of studies that consider combinations of vertical and horizontal loads, “Combined loads”. A research program to overcome such a lack is in progress. The current paper deals with the first experimental step in this research program, which concerns the performance of a vertical helical pile of a single helix, penetrating cohesionless soil and subjected to different combined loads. The diameter of the helix was considered 2.50 times the diameter of the pile shaft, while its location (H) varied with respect to the embedded length of the pile (L), from shallow to deep position, (0.20 ≤ H/L ≤ 0.90). Horizontal loads – Horizontal displacement relations were obtained with and without vertical loads. Without vertical loads, shallow helices, (0.30 ≤ H/L ≤ 0.50), improved the pile performance against horizontal load than deeper helices. The effects of combined loads were investigated under the action of two constant vertical loads, V1 and V2. The best performance against horizontal loads under the action of the vertical load, (V1=Vult (conv.)), was observed at (H/L > 0.50), whereas, under the action of the vertical load, (V2=2Vult (conv.)), the best improvement corresponded to the shallowest helix and decreased slightly with increasing (H / L).

Helical pile; Cohesionless Soil; Combined loads; Experimental Work

Geotechnical Engineering (GEO)