Abstract
A three-dimensional analysis method is developed for subway tunnel/soil dynamic interaction problems. Saving of computational cost is achieved by applying Floquet transform and Fourier expansion in the track direction to the railway track and tunnel/soil subsystems. This formulation needs the finite element discretization only in the tunnel cross section. The infinite soil domain is represented by an impedance matrix derived from analytical solution. Through numerical analyses of vibration reaction due to a stationary harmonic loading, the influence of track structures on the vibration reduction is discussed.
