Study on Penetration Resistance of Jacked Piles Considering Friction Fatigue

The penetration resistance of jacked piles changes with different embedded depth,it is the integrated exhibition of soil properties and provides significant basis for selecting the jacked piling equipment and calculating the ultimate resistance capacity.Now,many methods assume friction resistance as a constant,but the fact is that friction resistance at fixed depths tends to reduce as the relative depth of the pile tip increases.The regularity of fiction fatigue was analysed and a new method calculating penetration resistance was presented.Example shows that it is reasonable and useful.