Abstract:Reasonably and effectively simulating pile-soil-structure dynamic interaction is important in the seismic response analysis and foundation treatment of the nuclear island building over soft ground conditions. In this paper, based on the actual project of a proposed nuclear island plant, the contact effect between the pile and soil around the pile was simulated with the Goodman element, and the nonlinear characteristics of the near-field soft soil foundation are described by equivalent linear method. At the bottom and side of the model, the viscous boundary was introduced to simulate the radiation damping effect of the semi-infinite ground, so that the analysis model for the pile-soil-nuclear island structure interaction was established under the condition of the soil foundation. Furthermore, by comparing and analyzing the floor response spectrum and relative displacement (absolute value) of structure nodes under conditions of the original foundation and rock-socketed pile foundation, respectively, the influence of the rock-socketed pile foundation, considering the contact effect between the pile and soil on the nuclear island building, was analyzed. The results can provide some reference for the foundation treatment of nuclear island structures under similar soil foundations in practical engineering.