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UPSC Civil Service Exam Questions

Q1: A 30 cm diameter friction pile is embedded 10 m into a homogeneous consolidated deposit. Unit adhesion developed between clay and pile shaft is 4 t/m2 and adhesion factor is 0.7. The safe load for factor of safety 2.5 will be

A 21.50 t

B 11.57 t

C 10.55 t

D 6.35 t

ANS:C - 10.55 t

Adhesion factor * cohesion * surface Area of pile.
a * C * A.
A = 2π * r * h.
.7*4*{2*3.14*.15*10}.
= 26.4.

safe load = 26.4/2.5.
= 10.55.



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