Abstract:
Helical piles have traditionally been associated with relatively small shaft sections and considered primarily for axial loading applications with limited lateral or moment resistance. Â As a result, their use is sometimes limited during early foundation selection when structures are expected to experience moderate to high lateral loads or strict deflection criteria. Advances in helical pile manufacturing, installation equipment, and analytical methods have expanded the range of applications where these systems can perform effectively, including projects where lateral resistance and stiffness are critical design considerations.
This presentation examines the use of helical piles to support structures subjected to moderate to high lateral loads in soft soil conditions commonly encountered along the Gulf Coast. Several case studies from projects in Louisiana are presented where helical pile foundations were successfully implemented to meet demanding serviceability requirements in soft clay profiles. These projects highlight the adaptability of helical pile design to the conditions of the site, soil properties, constructability, and environmental concerns.
The case studies provide unique design strategies that were used to address lateral loading demands in soft soils, while also considering site-specific conditions, installation, and client driven concerns. Â Analytical approaches used during design are discussed, along with considerations when evaluating helical pile behavior using commonly available lateral analysis tools.
The objective of this presentation is to illustrate how helical piles can be effectively utilized in situations where lateral loads and deflection limits are driving design considerations. By presenting project-based examples from soft soil environments, the discussion aims to provide owners and engineers with additional insight into how helical piles may be evaluated and implemented as part of the deep foundation toolbox when project conditions require both axial capacity and lateral performance.