A 12-in.-square prestressed concrete pile is to be installed in sandy soil for a marine structure. The pile will be 40 ft long. It will be jetted 30 ft and driven the last 10 ft. The water table is at...

A 12-in.-square prestressed concrete pile is to be installed in sandy soil for a marine structure. The pile will be 40 ft long. It will be jetted 30 ft and driven the last 10 ft. The water table is at the ground surface. The saturated soil weight is 120 pcf. The angle of internal friction is 35°. Using the basic procedure for an effective stress analysis, and referencing Figure 31, calculate the safe (design) axial downward loading, using a factor of safety of 2.75.