A group of 30 HP 10 x 57 piles are arranged in a 5 x 6 grid at 27 in on center. The soil is a clay with unit side friction resistance fs = 2000 lb/ft² and a unit toe bearing resistance qn² = 15000 lb/ft². See table 21.1 for the steel H-pile cross-sectional data of the standard H profiles in the Coduto book or elsewhere. Assume that H-piles are plugged. a) Determine the pile length which separates individual and block failure of pile group. b) Determine the nominal capacity of the pile group Png at this critical length.

Q2: The plan of a group piles is shown below. Assume that the piles are embedded in a saturated homogeneous clay having a 7sa= 19.24 kN/m, C=41.2 kN/m? .Given: diameter of piles (D) = 305 mm, center-to-center spacing of piles 762 mm, and length of piles = 13.7 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. P

2. A 40 cm diameter pile carries an allowable load of 200 kN with unit weight of 19 kN/m3 and cohesion of 48 kPa. determine the following:(a) Lengthofthepile.(b) Unconfined compressive strength.

5. Discuss five advantages of using large diameter bored piles compared to driven steel H-piles for supporting a tall building located in urban areas.

A group of 16 piles of 50 cm diameter in arranged with a centry to centre sporing of 1.0 m. The piles are 9 m long and are embedded in soft stay with cohesion 30kN / (m^5) Bearing resistance may be neglected for the piles-Adhesion factor is 0.6. Determine the ulti mate Load capacity of the pile group.

A rectangular pile (0.55 x 0.92 m.) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 6 m., cohesion of 54 kPa, friction factor of 0.83. Second layer has a height of 6 m., cohesion of 74 kPa, and friction factor of 0.8. Compute the allowable load that the pile can carry if the factor of safety is 2.52. Round off to two decimal places.

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Situation 5 - A rectangular pile (0.77 x 0.72 m.) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 7 m., cohesion of 53 kPa, friction factor of 0.89. Second layer has a height of 8 m., cohesion of 78 kPa, and friction factor of 0.88. (A.) Compute the skin friction resistance in kN. Round off to two decimal places. (B.) Compute the end bearing capacity in kN. Round off to two decimal places. (C.) Compute the allowable load, in kN, that the pile can carry if the factor of safety is 2.00. Round off to two decimal places.