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Consider the soil profile shown below. The minimum number of precast concrete piles of 300 mm diameter required to safely carry the load for a given factor of safety of 2.5 (assuming 100% efficiency for the pile group) is equal to (Answer up to the nearest integer)
    Correct answer is '20'. Can you explain this answer?
    Verified Answer
    Consider the soil profile shown below. The minimum number of precast ...
    Group pile Qg = n. Qf ng
    Where, Qg = load carried by group pile
    = 5000 kN = number of piles; ng = efficiency of pile group = 100%
    Qf = load carried by single pile
    = end bearing load + skin friction
    = C Nc Ap + dc As Nc = g (for clay)
    = [150 * g* π /4 * 0.32] + [0.57* 100 * π * 0.3 * 10]
    = 632.64 kN, taking FOS, Qf = 632.64/2.5 = 253 kN
    So;
    Qg = η. Qf η g
    5000 = n * 253 * 1
    n = 19.76 ≈ 20 nos.
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    Most Upvoted Answer
    Consider the soil profile shown below. The minimum number of precast ...
    Group pile Qg = n. Qf ng
    Where, Qg = load carried by group pile
    = 5000 kN = number of piles; ng = efficiency of pile group = 100%
    Qf = load carried by single pile
    = end bearing load + skin friction
    = C Nc Ap + dc As Nc = g (for clay)
    = [150 * g* ℼ /4 * 0.32] + [0.57* 100 * ℼ * 0.3 * 10]
    = 632.64 kN, taking FOS, Qf = 632.64/2.5 = 253 kN
    So;
    Qg = η. Qf η g
    5000 = n * 253 * 1
    n = 19.76 ≈ 20 nos.
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    Consider the soil profile shown below. The minimum number of precast concrete piles of 300 mm diameter required to safely carry the load for a given factor of safety of 2.5 (assuming 100% efficiency for the pile group) is equal to (Answer up to the nearest integer)Correct answer is '20'. Can you explain this answer?
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