Optimizing Substation Foundations: A Case Study on Vibratory Metal Displacement Piles

Over the years, American Electric Power (AEP) has piloted various alternative foundation solutions for substation and transmission line projects to enhance overall safety, efficiency, cost, and reliability. Driven by the need to reduce the costs associated with traditional concrete drilled pier foundations in challenging soil conditions, AEP began exploring the use of vibratory metal displacement piles (VMDPs) on selected projects. This paper includes an examination of the benefits realized from installing over 100 vibratory metal piles at AEP’s Chemical Substation. The use of VMDPs here significantly reduced installation time, construction costs, potential environmental contamination, waste disposal, and foundation material at the site, while also increasing overall project safety, compared to traditional cast-in-place concrete drilled piers. The paper also summarizes the geotechnical and structural considerations for metal pile usage and the environmental and geological factors that make these foundations an optimal solution. The authors conclude by describing AEP’s current state of practice for vibratory metal displacement pile usage and opportunities to further refine their best practices for future implementation.