Helical piles are becoming increasingly popular in construction projects, particularly as potential offshore foundation systems, due to their lightweight and multipurpose engineering applications. Their rising demand is driven by the need for reliable and efficient foundation systems capable of supporting heavy loads. This study focuses on evaluating the bearing capacity of helical piles in mixed soil conditions through detailed numerical simulations. Using finite element modelling techniques, particularly Plaxis 3D software, the study investigates the load-settlement behaviour of helical piles under vertical point load and uplift static load. The analysis examines the influence of soil properties, pile geometry, and number of helices on pile performance, with an emphasis on mixed soil profiles consisting of clay and soft-weathered rock layers. The numerical model developed in Plaxis 3D was initially validated against experimental data using a laboratory-scale model on cohesion-less soil. Further research and simulations were conducted on layered soil conditions, offering a more comprehensive understanding of the behaviour of helical piles across mixed soil type. The findings offer valuable insights into optimizing helical pile design, particularly for challenging soil conditions, and contribute to the broader application of these systems in foundation engineering.