What is the second most common foundation used in constructing a substation?

In the context of substation construction, drilled shafts serve as an effective foundation type due to their ability to transfer heavy loads directly to deeper, more stable soil layers. This geotechnical approach is particularly beneficial when the surface soil conditions are unsuitable or when a high level of structural support is required for the equipment being installed.

Drilled shafts are commonly utilized in substations because they provide increased stability and resilience against vertical and lateral loads. Their design allows for flexibility in construction, accommodating various site conditions and preventing unnecessary ground disturbance compared to other methods. By reaching below surface layers into more competent soils, they are adept at resisting any potential shifting caused by environmental factors.

While slabs on grade and other foundation types can be used in certain contexts, drilled shafts are preferred as a secondary option due to their strength characteristics and performance under demanding conditions. This makes drilled shafts an excellent choice for ensuring the longevity and reliability of the infrastructure in substations.