Load bearing mechanism of screw piles under compressive loading in clayey soil
Load bearing mechanism of screw piles under compressive loading in clayey soil
In this study the load transfer mechanism of screw piles under compressive loading in clayey soils is studied. 3D Finite Element analysis was used to estimate the load bearing mechanism of screw piles. The results revealed that the pile head load-displacement response of the screw pile with inter-helix spacing ratio smaller than 3 can be captured in a piecewise curve in three stages: (i) an initial linear stage; (ii) a non-linear stage and (iii) a final linear stage. For an inter- helix spacing ratio greater than 3, the load-displacement curve can be described by the first two stages without the final linear stage. During the initial linear stage of the pile response, the performance of the screw pile is linear elastic. At the second stage, most of the soil strains are concentrated in the vicinity of the helix plates where behave as individual plates with little interaction between them. At the third stage, the bearing mechanism forms a cylindrical shear band leading to a linear response. The load associated with the intersection point of the 2nd and 3rd stages of the pile response was recognized as the phase transition load, which the load bearing mechanism of the screw pile changes. The phase transition load of the screw piles depends on the pile geometry.
P. Zahedi; David Igoe
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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