Based on the fact that the bearing capacity of pile depends of the condition of pile body
mechanical parameters of the media around it
and loading period
the mechanism of dynamic and static bearing capacity for the single-pile is studied. Considering loading rate and difference between dynamic and static mechanical strengths of rock and soil media
a dynamic measurement is proposed to determine critical bearing capacity of frictional piles
which has been proved to be simple and effective with engineering applications and comparison between dynamic and static tests.