A concrete pile 20 m long and having a cross section of 0.38m x 0.38m is fully embedded in sand, for which γ = 17 kN/m3 and φ’ = 25o. Calculate: a) The ultimate point load, Qp, by Meyerhof’s method b) The total frictional resistance for K=1.4 and δ= 0.7φ.  c) The allowable pile capacity for a FS = 3.

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SITUATION 13: A 0.30 m square prestressed concrete pile that is 10 m long is to be driven in a clayey soil whose unconfined compressive strength is 115 kN/m³. The unit weight of clayey is 18 kN/m³. The pile has a design capacity of 360 kN.45. Which of the following most nearly gives the end bearing capacity of pile if Nc=9?a. 25.63 Kn b. 41.55 KN c. 46.58 Kn d. 18.65 Kn46. Which of the following gives the skin friction capacity of pile if =0.76? a. 583.29 Kn b. 680.47 Knc. 501.65 Kn d. 605.21 Kn47. Which of the following most nearly gives the pile capacity if factor of safety is 2.0? a. 420.5 Kn b. 260.5 KN c. 186.6 Kn d. 363.5 Kn

A 0.30 m. x 0.30 m. concrete pile 22 m. long is driven in a clayey soil having an unconfined compressive strength of 110 kN/m². The unit weight of clayey soil is 18 kN/m3. Frictional constant is 0.76 due to skin friction. Assume a factor of safety equal to 2.0 and a bearing capacity factor Nc = 9. Compute the capacity of pile due to skin friction only. %3D

Question- A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m² and unit weight is 15 kN/m³, the negative skin friction of the pile group is un kN.