The action of negative skin friction on the pile is to

increase the ultimate load on the pile
reduce the allowable load on the pile
maintain the working load on the pile
reduce the settlement of the pile

Correct answer: reduce the allowable load on the pile

Solution

Negative skin friction occurs when the soil surrounding a pile moves downward relative to the pile, effectively adding a downward force that reduces the pile's capacity to carry loads. This results in a decrease in the allowable load on the pile, as the negative skin friction counteracts the load the pile can safely support.

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