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Question

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
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B
11.57 t
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C
10.55 t
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D
6.35 t
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Solution

The correct option is C 10.55 t
The friction load capacity,

qf=α×cu×PL

Given α=0.7;cu=4 t/m2

P=π×0.3m; L=10 m

qf=0.7×4×π×0.3×10=26.4

Safe load=26.42.5=10.55 t

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