Types of Pile Foundations. Classification by Function (Load Transfer) ​This category describes how the pile transfers the structural weight into the ground. ​End-Bearing Piles: Transfer loads directly to a hard, stable layer like rock or dense sand. They act like underground columns. ​Friction Piles: Gain support through the friction or adhesion between the pile surface and the surrounding soil. ​Friction-cum-End-Bearing Piles: Use a combination of both tip resistance and shaft friction for supp