Study on Numerical Solution to Soil Dynamic Impedance for Nuclear Power Plants Based on SBFEM

Based on the outstanding advantages of the scaled boundary finite element method（SBFEM） for the problem of infinite domain,an improved numerical solution to the soil dynamic impedance of the nu-clear power plants is presented in this paper,by utilizing a continued-fraction solution of SBFEM analysis,which is especially fit for the numerical simulation of non-homogeneous layered soil region,and also can give the soil dynamic impedance varying with the excitation frequencies.Through the numerical example of a rectangular base,the rationality of the continued-fraction solution algorithm was shown.Finally,mainly aimed at the solution to half-space homogeneous/layered site problems,some numerical results are given to validate its accuracy and applicability by comparing with the harmonic response analysis of viscoelastic soil dynamic model.