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.
Highlights
Screw piles or helical piles are deep foundation elements used to resist forces exerted by tension, axial compression, and lateral loading [1]
Large helical piles are being used as a result of the great development of hydraulic torque motors has made it easier to install screw piles of large diameter, the shaft diameter currently in use range from 73 to 965 mm and helix diameter range from 152 to 1219 mm with axil capacity larger than 3MN [6,7]
Helical piles with this relatively large diameter can used in large structures, for example offshore platforms, high-rise buildings, bridges and wind turbine foundations and these structures are subjected to lateral loads in addition to vertical loads, and this should be taken into consideration for the design [8]
Summary
Screw piles or helical piles are deep foundation elements used to resist forces exerted by tension, axial compression, and lateral loading [1]. Large helical piles are being used as a result of the great development of hydraulic torque motors has made it easier to install screw piles of large diameter, the shaft diameter currently in use range from 73 to 965 mm and helix diameter range from 152 to 1219 mm with axil capacity larger than 3MN [6,7] Helical piles with this relatively large diameter can used in large structures, for example offshore platforms, high-rise buildings, bridges and wind turbine foundations and these structures are subjected to lateral loads in addition to vertical loads, and this should be taken into consideration for the design [8].
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