Numerical Analysis On The Effect Of Creep And Discrepant Settlement On The Pile Foundation

The interaction between the soil and pile foundation is a main problem in the engineering process. In soft soil condition, this problem becomes more important. Using FEM calculation, this paper systematically analyses the effect of creep and discrepant settlement on the pile foundation.Tianjing harbor 25～26 section which was damaged seriously is chosen as study object of this paper. Based on this, using FEM software PLAXIS to separately discuss the interaction between the soil and pile foundation in soft soil, hard soil, loading and variation of slope and time condition.Firstly, in accordance with the existing sand slot experiment and soil acentric experiment, establish PLAXIS model. After the calculation, compare the outcome with the experiments'. It verifies the rationality that using PLAXIS to institute the interaction between the soil and pile foundation, and the way in which to overcome the PLAXIS's fault is available .Secondly, establish the two-dimensional FEM model of Tianjing new harbor 25～26 section, and simulate the pile foundation structure with Linear-Elastic model, the soil layers depend on the situations with soft-soil-creep model or Mohr-Coulomb model, and the interface between the structure and clay is fully considered. Then study the interaction between the soil and pile foundation in 6 situations.Finally, compare the outcome from different situations. Then analyse the creep and discrepant settlement's effect on the interaction between the soil and pile foundation. It is shown that soft soil creep, rear loading and time increasing could increase the maximal bending movement, maximal axial force and maximal horizontal displacement of pile foundation, which badly damage the harbor. Less steep slope could minish the maximal bending movement and maximal horizontal displacement, but it could increase the budget.Summarily, the study of the effect of creep and discrepant settlement on the pile foundation is relatively comprehensive, the conclusion is precise. So it has some academic and practical value for the design and construction of high-pile foundation harbor.