Load bearing capacity of the large-diameter steel pipe piles under vertical loads

In recent years,the load bearing capacity of large-diameter steel pipe piles has attracted more and more attention from researchers.Taking Z2 pile,a large-diameter steel pipe test pile of the newly-built oil terminal in Zhanjiang Port as the research object,and employing the static loading test given by finite element simulation,the influence of pile diameter,pile length,pile-soil friction coefficient and pile-soil compressive modulus on the load bearing capacity of large-diameter steel pipe piles was studied.The results show that the ultimate load and lateral friction resistance of the pile are increased respectively with the increment of pile diameter,the ratio between pile tip resistance and pile top settlement is gradually decreased,and the pile tip resistance is decreased as the increase of pile diameter.The ultimate load bearing capacity and lateral friction resistance of the pile are significantly increased respectively with the increment of the pile length,however,the ratio between pile tip settlement and pile top settlement is gradually decreased;if the friction coefficient of pile side soil is increased,the ultimate load bearing capacity of the pile will be significantly increased,and especially when the friction coefficient is increased from 0.3 to 0.4,the pile top settlement is decreased largely;the ultimate vertical load bearing capacity of the pile is significantly increased with the increment of the pile-soil compression modulus.These results are instructive for the design and construction of similar projects.