Time-History Analysis on Seismic Stability of Nuclear Island Bedrock with weak Interlayer

This paper presents a three-dimensional numerical simulation method for the seismic response calculation of nuclear island foundation based on the nuclear power plant in Tai Shan. There are two weak interlayers in the bedrock. The numerical simulation aimed at the analysis and the evaluation of the stability of bedrock with the consideration of the interaction between the bedrock and nuclear island. Main features of nuclear numerical model are: (1) the mechanical interaction of nuclear island buildings, turbine room and bedrock have been taken into consideration, (2) the two weak interlayers may decrease the stability of the bedrock, which are the focused research in the models, (3) non-reflective free field boundary have been used in the boundary condition of model. The commercial numerical software FLAC3D has also been used in the simulation and analysis. A finite difference of numerical model for nuclear island bedrock was established and it have been used to analyze the bedrock's mechanical phenomenon and safety performance. Dynamic characteristics, distributions of mechanical parameters and failure characteristics of bedrock have been studied under the action of seismic wave.