<p>A deep foundation system transfers loads from piles to the surrounding or underlying soil layers primarily through surface friction. Various types of deep foundations exist, including barrette piles, which are typically produced with rectangular cross-sections but may also have alternative shapes such as +, H, L, or T. In this study, large-scale field tests were conducted on loose sandy soil using three types of barrette piles rectangular, +, and H shapes as well as a circular bored pile, all constructed from concrete with identical cross-sectional areas and lengths. These tests were further analyzed using three-dimensional numerical modeling. The primary aim was to compare the compressive behavior of piles with different cross-sectional geometries and to investigate how pile geometry influences performance through field testing. Four different pile types were tested, and the displacement responses under equal loading were ranked as follows: rectangular, H, circular, and + cross-sections. The numerical modeling results showed strong agreement with the field test findings, demonstrating the reliability of the numerical approach.</p>