The Analysis Of The Influence From Seismic Oscillation To The Nuclear Structure Under Layered Foundation

Nuclear energy is a clean, efficient new energy, provides a reliable way to solve the global energy crisis.The nuclear energy have more development space in our country, which is actively develop nuclear power to provide a guarantee to alleviate the problem of our country’s power. Nuclear power has many advantages, at the same time, there are a lot of risk. Once the nuclear damage occurs will have very serious consequences, such a precedent has occurred in some countries.In order to ensure the safety of nuclear power structure, to avoid nuclear structure damage leading to nuclear leakage, analysis of earthquakes and other natural factors have led to the destruction of nuclear structure is very important.Seismic analysis of nuclear power plant structures, it is necessary to consider the problem of structure and space complexity, structure-foundation interaction and the input of the seismic. Taking into account the natural venue often has weak interlayer and assumes layered distribution, in order to make the calculation and analysis closer to the actual situation, nuclear seismic response analysis of layered soil analysis is critical, assumed that the foundation layered analysis of nuclear power seismic response is critical.This article is based on the precise integration algorithm, derived the case of two-dimensional and three-dimensional layered soil dynamic stiffness matrix calculation method respectively, established the layered soil dynamic model.based on the precise integration method.Dynamic model for two-dimensional layered soil, in order to verify the accuracy of Precise Integral Algorithm, Numerical analysis research on ground vibrations caused by high-speed trains based on layered semi-infinite foundation model.This article we get the dynamic response of the ground under train loads. In addition we also analysis the rigid foundation vibration problems caused by load, and the results were compared with the time domain boundary element method to verify the reliability of the precise integration method.Consider the layered ground dynamic model with the upper nuclear power plant interactions impact on the calculated result, the upper nuclear power plant lumped parameter model can be simplified.Precise integration method (PIM) and integral transform method (Fourier) are applied to solve the governing equation of wave propagation in the frequency domain. The precise integration method can not only efficient and accurate solution of the problem of the wave propagation in layered soil, and avoid facing the index overflow which commonly used in the transfer matrix method. This article based on finite element method and precise integration algorithm respectively analysis the floor response spectra under different ground conditions. Showing the precise integration algorithm is applicable method for calculating and analysis the response of the nuclear structure under layered ground, at the same time,reveals the impact of the of layered ground on the nuclear structure. The results shows that the peak response spectrum of the nuclear power plant in layered soil conditions are greater than the value of the homogeneous field conditions. In addition, it shows that the layer model based on the precise integration method is better reflect the trend Floor Response Spectra changes with the excitation frequency than the element method.