مشخصات پژوهش

Screw piles, as a member of screw anchor group, are designed to resist axial compression, axial tension and lateral loads. In this study, the effects of helix spacing on screw piles behavior and soil properties on the bearing capacity of these piles under compressive loading in sandy soils are investigated. The results show that the bearing capacity of screw piles increases with rising the elastic modulus and internal friction angle of the soil. The bearing capacity of pile is relatively more sensitive to change of helix diameter in soils with high elastic modulus. At screw piles with great helix spacing, helix plates act individually, while for ones with low helix spacing the soil between helix plates acts as rigid cylindrical soil. In addition to the introduced mechanisms of screw pile performance, the new behavior of screw pile was identified, which is the combination of previous mechanisms. Also, there is a direct relationship between the elastic modulus and internal friction angle of soil and bearing capacity of screw piles.