Vertical-pile resistance to lateral loads is a function of both the flexural stiffness of the shaft, the stiffness of the bearing soil in the upper 4 to 6D length of shaft, where D=pile diameter and the degree of pile-head fixity.

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The most commoly used formula to determine the allowable static load on a pile is the Engineering News formula.This is given below:

P_a=(2WH)/(p+1)

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