GATE Questions & Answers of Load capacity of piles in sands and clays

What is the Weightage of Load capacity of piles in sands and clays in GATE Exam?

Total 3 Questions have been asked from Load capacity of piles in sands and clays topic of Foundation Engineering subject in previous GATE papers. Average marks 2.00.

A 0.5 m × 0.5 m square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength, c_{u} = 50 kPa and unit weight, γ = 18.0 kN/m^{3}. The design capacity of the pile is 500 kN. The adhesion factor $\style{font-family:'Times New Roman'}\alpha$ is given as 0.75. The length of the pile required for the above design load with a factor of safety of 2.0 is

Two identical concrete piles having the plan dimensions $\style{font-family:'Times New Roman'}{50\;\mathrm{cm}\times50\;\mathrm{cm}}$ are driven into a homogeneous sandy layer as shown in the figures. Consider the bearing capacity factor N_{q} for 30º as 24.

If Q_{P1} and Q_{P2} represent the ultimate point bearing resistances of the piles under dry and submerged conditions, respectively, which one of the following statements is correct?

A pile of diameter 0.4 m is fully embedded in a clay stratum having 5 layers, each 5 m thick as shown in the figure below. Assume a constant unit weight of soil as 18 kN/m^{3} for all the layers. Using λ-method (λ = 0.15 for 25 m embedment length) and neglecting the end bearing component, the ultimate pile capacity (in kN) is _____.