The College of Engineering, Diyala University discussed a master thesis on the performance of screw piling systems under inclined lifting loads in sandy soil by the postgraduate student, Ms.  Safa Adnan Qai.

The thesis aimed at studying the behavior and performance of screw piling systems used in various engineering applications when subjected to inclined tensile loads, these piling systems are known for their high efficiency, ease of construction, and ability to resist tensile, lifting, horizontal, and overturning loads.

The thesis included conducting 60 practical tests on systems of single- and double-helix screw pilings arranged in a square (2x2) configuration and buried in sandy soil at two relative densities (50% and 68%). 

The thesis investigated the effect of several important variables, including the number of helical plates, the spacing between pilings, and the relative density of the soil, as well as increasing the angle of inclined loading leads to a gradual decrease in tensile strength, with the decrease being limited at small angles and increasing significantly at large angles. 

The thesis reviewed that increasing the relative density of the soil contributes to improve tensile strength because of the increased shear resistance of the soil.