A 0.5 × 0.5m square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength, cu = 50 kPa and unit weight, g = 3180 kN/m3. The design capacity of the pile is 500 kN. The adhesion factor a 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

A 0.5 × 0.5m square concrete pile is to be driven in a homogeneous cl

1.	A 0.5 × 0.5m square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength, cu = 50 kPa and unit weight, g = 3180 kN/m3. The design capacity of the pile is 500 kN. The adhesion factor a 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
A.	5.2 m
B.	5.8 m
C.	11.8 m
D.	12.5 m
Answer» D. 12.5 m

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