GATE Exam Questions - Engineering

Q1:

A pile of 0.50 m diameter and of length 10 m is embedded in a deposit of clay. The un-drained strength parameters of the clay are cohesion = 60 kN/m2 and the angle in internal friction = 0. The skin friction capacity (kN) of the pile for an adhesion factor of 0.6, is

A 671

B 565

C 283

D 106

ANS:B - 565

What is 3.142 here? Please explain the answer clearly.