Analysis of Sinking Mechanism and Finite Element for Static Pile in Collapsed Loess Region

The static pile sinking calculation model has been established based on cavity expansion theory and the elastic-plastic analytical solution has been solved. This model can truly reflect the static pile sinking mechanism in collapsed loess region, providing a theoretical basis for the analysis and design of static pile. A finite element model has been set up to simulate the entire pile sinking process. The results show that due to relatively large pile rigidity and strength compared with the soil, under instantaneous load, the surrounding soil will produce a large deformation, which is mainly caused by pile friction diffusion. When the external load increases, the interaction between stress and pile-soil gradually increases; when reaching the proportion of limited load, both of them are close to constant, accordingly, the growth slows down and tend to be stable; when the external load is greater than the proportional limit load, the phenomenon of mutation occurs. Finally, after comparison, the finite element calculation results match well with the test results. Through analysis and engineering practice, static pile is found to have a good prospect in collapsed loess region. Some useful conclusion can be used as references for similar projects in these areas.