Design Philosophy - Vertical Loads - Deep Foundations.

Analyses are performed to determine the diameter or cross section, length and number of driven piles or drilled shafts required to support the structure, and for procuring the corred materials and equipment to construct the foundation.

a. Type of loads.  Loads applied to deep foundations consist of vertical forces and horizontal forces. These forces are resisted by the soil through bearing and friction. Therefore, the pile capacity analysis should be performed to determine that foundation failure by bearing or friction will be avoided, and load-displacement analysis performed to determine that foundation movements will be within acceptable limits....