In case of pile foundation, the negative skin friction may occur at a load which is

Lower than design load

Higher than design load

Equal to design load

Of any magnitude

Negative skin friction is the process where skin friction acts downward due to soil.
When skin friction is acting downwards it would decrease the pile capacity.
Negative skin friction (also known as downdrag), could be a major problem in some sites.
Negative skin friction is usually a downward shear drag acting on a pile or pile group due to downward sinking of surrounding soil relative to the piles.
It occurs when a load higher the design load comes to action.

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