Redo Problem 9.27 with the following: center-to-center spacing of piles = 30 in., length of piles = 45 ft, D = 12 in., c_u = 860 lb/ft², and FS = 3. Use Table 9.10.

  

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The plan of a group pile is shown in Figure P 9.27. Assume that the piles are embedded in a saturated homogeneous clay having a c_u = 90 kN/m². Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles = 600 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use Table 9.10 and FS = 3.

  

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