Q. Negative skin friction on a pile under vertical compressive load acts :

A
Downwards and increases the load carrying capacity of the pile
B
Downwards and reduces the load carrying capacity of the pile
C
Upwards and increases the load carrying capacity of the pile
D
Downwards and maintains the same load carrying capacity of the pile
Solution:

Negative skin friction is basically a shear drag on the pile acting downwards. It causes the pile to sink and subsequent reduction in the load carrying capacity

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