Abstract
Objectives: To study about the design and the ultimate load capacity of helical piles, this depends on various parameters of helices. Methods/Analysis: This project focuses on analytical study of the response and behaviour of Helical Piles in the medium stiff clay. The parameters to be analysed are: Diameter of helical piles, outer diameter of hollow pile shaft and spacing between the adjacent helical plates. An optimal pile configuration was chosen and is then modelled using Helix Pile software based on the provided soil properties and its results are verified against the analysis results. Further, a case study was also done by comparing the capacities, scheduling and economic feasibility of Helical Piles and conventional concrete piles. Findings: From the analytical study it can be concluded that the increase in diameter of the helical plates has positive effect on the uplift capacity and compression behaviour; on the other hand the increase in the outer diameter of pile shaft has negative impact on the same. The spacing between the helices also increases the uplift capacity and compression behaviour of helical piles. Also Helical Piles are cost effective; require less in number and faster erecting when compared to concrete piles. Keywords: Helical Piles, Helical Plates, Medium Stiff Clay
Highlights
Helical Piles are a valuable component in the geotechnical industry
Diameter of pile shaft has negative effect on pile capacity, as the diameter of the pile shaft increases, the capacity of the helical pile decreases. (Since we have a constant helical plate diameter, an increase in pile shaft diameter would lead to a decrease in the helical plate area and the resistance offered by the plates is reduced)
The load obtained from helix pile software was verified against the pile capacity obtained from the analytical study and the value was found to be within the range
Summary
Helical pile consists of a high strength circular/square shaped steel shaft to which one or more helix shaped bearing plates are attached (Figure 1). They are driven through the ground by twisting or ’torqueing’ and the load carrying capacity of the pile is provided by helical plates and shafts by means of end bearing and skin friction respectively. Helical Piles can resist tensile loads as as compressive loads. Some of the typical land structures for which this type of piles can be used are high rise buildings, chimney towers and transmission towers. In case of offshore structures, wave forces produce enormous tensile forces in the foundation system and Helical Piles are more suitable in such cases.
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