May 14 Daily Question: Uplift Capacity of a Pile

NCEES Civil PE Specification III.D.: Bearing Capacity


Problem

A 3-foot diameter Cast-In-Drilled-Hole pile is installed in a saturated clay layer to a depth of 20 feet. The soil was found to have an undrained shear strength of 2 ksf at the surface and 4 ksf at a depth of 20 feet, varying linearly. Given a shaft weight of 20 kips and an adhesion factor α of 0.55, determine the uplift capacity of the shaft.

 

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