A group of 25 HP 10 × 57 piles are arranged in a 5 × 5 grid at 27 in on center. The soil i...

A group of 25 HP 10 × 57 piles are arranged in a 5 × 5 grid at 27 in on center. The soil is a clay with unit side friction resistance, fn of 2000 lb/ft2 and a unit toe bearing resistance, q′n, of 15,000 lb/ft2. Determine whether individual or block failure controls the design, and determine the nominal capacity of the pile group, Png. See Table for cross-sectional dimensions of each pile.