Abstract
Screw piles are used in different projects such as underpinning, lateral support of retaining wall, foundation of tower and under pipeline. In recent years, the use of screw piles became wide in all world as a result of low cost, ease of installation and need simple machines to construct. A laboratory study of triangle pattern of screw piles group embedded in soft clay and extended to sand soil layer is carried out. Different parameters are investigated such as spacing between piles, number of helix plates and slenderness ratios L/ D. The results of this study showed that the efficiency of screw piles group increases when group extended to sandy layer. Also, a study showed that the compressive capacity of triangular pattern group decreases with increase spacing between piles for group of single and double helix plates. The percent’s of reduction are (61, 22, 15) % and (56, 25, 29) % for single and double helix group respectively
Highlights
Soft clay soils are recent alluvial deposits presumably formed through the most recent 10,000 years described by their featureless and flat ground surface, [1, 2]
The results of these models are discussed in detail as follows: 1. Effect of L/ D ratio on ultimate compressive capacity: It is clear from figures (3, 4) that as the ratio of L/ D increases, the ultimate capacity of compressivev of triangular piles group increases for both group of single and double helix with different spacing
Many points are included from this study which is: 1. Compressive capacity of triangular capacity screw piles group increases with increase L/
Summary
Soft clay soils are recent alluvial deposits presumably formed through the most recent 10,000 years described by their featureless and flat ground surface, [1, 2]. The axial load performance of helical piles group study on model piles in sand soil with different parameter, the sand density, the number of piles in the group and the spacing between the piles is investigated by [9]. The statement showed optimistic group effect in loose to middle state, while negative group effect is experimental in dense state (Dr of 80%) It found that the pile spacing, relative density and L/D ratio are greatest important effect on the group efficiency [14]. Different parameters such as spacing between piles, number of helix and L/ D ratio for triangular group piles under compressive loading are investigated in this study
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