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, cu = 50 kPa and unit weight, γ = 18.0 kN/m3. 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 Nq for 30º as 24.

If QP1 and QP2 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/m3 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 _____.