5 Conclusions
1) When the numerical simulation method is adopted to simulate the mechanical effect of pile foundation under cyclic dynamic loads, it can be seen that the decreasing amplitude of the development law of axial force is the biggest during the previous 10 cycle periods, and the ultimate radial stress of pile lateral is similar for different cyclic displacement amplitudes.
2) In the view of cumulative settlement of pile head, the cumulative settlement basically shows linear growth with the cycle times under the effect of different cyclic displacement amplitudes, and the bigger the amplitude is, the bigger the cumulative settlement of pile head under identical cycle times is.
3) The second development platform of ABAQUS is adopted to lead in the module of soil attenuation factor; the results indicate that the soil attenuation has a certain effect on axial force of pile body, shaft resistance of pile, and cumulative settlement of pile head. Considering the attenuation the soil suffers from, cumulative settlement of pile head, the axial force in the elastic zone of pile and the axial force increase as the shaft resistance of pile decreases under the same cycle times; however, the soil attenuation has little effect on the axial force and shaft resistance of pile in the plastic zone.
