Abstract:
The present work deals with the performance of screw piles constructed in gypseous
soil of medium relative density; such piles are extensively used in piles foundations supported
structures subjected to axial forces. The carrying capacity and settlement of a single screw pile
model of several diameters (20, 30, and 40) mm inserted in gypseous soil is investigated in the
present study. The gypsum content of soil used in tests was 40%. The bedding soil used in tests
was prepared by raining technique with a relative density of 40%. A physical model was
manufactured to demonstrate the tests in the laboratory. The model of screw pile has been
manufactured of steel with a total length of 500 mm and helix diameters of 20, 30, and 40 mm
continuous over the embedded depth of pile (400 mm). The results of tests showed decreasing
the ratio of length to diameter (L/D) resulted in a higher axial carrying capacity of screw piles
and low corresponding settlement.
