Laboratory Modelling and Analysis of Displacement Pile in Different Geometries on Alluvial Soils
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Date
2023Author
DINC, Taylan Ulas
DEVELIOGLU, Inci
PULAT, Hasan Firat
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Alluvial soils are weak soils that require precautions and have disadvantageous
engineering characteristics such as low shear strength and bearing capacity, high void
ratio, and settlement potential. Different foundation systems are preferred for
structures built on these soils to transfer the load effects safely. Pile foundations as
deep foundations are classified depending on various parameters such as; material
property, application method, and load-bearing method. In this study, cylindrical and
square concrete piles with different cross-sections and lateral areas were placed in
the alluvial soil. The natural alluvial soil taken from İzmir province, Balatcik location
was placed in a displacement-controlled pile model unit with a unit weight of ≈ 17
kN/m3. The manufactured concrete piles were driven into the soil with a Standard
Proctor hammer. Tensile effects were applied at different time intervals to examine
long-term and short-term behavior. As a result of experiments, load-displacement (py) and displacement-time (y-t) graphs were drawn. When the displacement piles were
examined under long-term tension, it was seen that the cylindrical piles displaced the
most. Square piles with the same cross-sectional area as cylindrical piles made less
displacement. All studies were modeled 1:1 as numerical and compared with
experimental results. Numerical investigations revealed that under long-term effects,
the highest displacements were observed in cylindrical piles, while the lowest
displacements were in square piles with equal cross-sectional area as cylindrical
piles. Under short-term tension effects, investigations showed that the highest
bearing capacity, according to both experimental and numerical results, was in square
piles which have an equal cross-sectional area with cylindrical piles. Studies showed
that the experimental and numerical results for pile behavior were compatible.
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