Influence of Spacing and Cross-Sectional Shaft of Screw Piles Group on Lateral Capacity

Azhar Subhi; Hassan O. Abbas

doi:10.24237/djes.2021.14110

Authors

Azhar Subhi
azharsubhi19@gmail.com
Department of Civil Engineering, College of Engineering, University of Diyala, 32001 Diyala, Iraq
Hassan O. Abbas Department of Civil Engineering, College of Engineering, University of Diyala, 32001 Diyala, Iraq

Keywords:

Screw pile, Helical pile, Spacing, Lateral resistance, Number of helices

Abstract

Although there are several high-capacity screw piles in use currently, there are few studies on their lateral performance. The aim of this study is to investigate the lateral behaviour of several models of screw pile group (1×2), (2×1), and (2×2) embedded in soft clay and extended to stiff clay under lateral static load. Three spacing between pile (1.5, 3, and 4.5) Dh (helix diameter) with a shaft diameter of 10 mm, single and double helix, and embedded length ratio L/d 40 were used. The results showed that increasing the number of the piles in the group had a larger effect, the lateral resistance of group (2×2) increase to about (2.5 and 3.2) times more than groups (2×1) and (1×2) respectively. While the increase of pile spacing in the groups from (1.5 Dh) to (3 and 4.5 Dh) increases the lateral resistance about 6-23% and 16-52% respectively. Also, the result showed that the screw pile with double helix gives an increase in lateral resistance about 3-8% from the single helix.

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