A 14-in.-diameter steel pipe pile is driven 50 ft into overconsolidated clays having the following properties: From zero to 20 ft depth the cohesion is 1,500 psf and the soil unit weight is 110 pcf;...

A 14-in.-diameter steel pipe pile is driven 50 ft into overconsolidated clays having the following properties: From zero to 20 ft depth the cohesion is 1,500 psf and the soil unit weight is 110 pcf; below 20 ft, the cohesion is 2,500 psf and the soil unit weight is 120 pcf. Using the α-method, calculate the downward and upward axial capacity of the pile, applying a factor of safety of 3 (downward and upward).