The Effects of Underground Structure on the Free Field Displacement Under Uniform and Non-Uniform Excitation

In this study, the effects of a subway station on the surface ground motion subjected to uniform and the non-uniform propagating seismic wave is investigated. Numerical analysis is carried out by finite difference method using FLAC soft-ware. Seismic wave scattering considering and ignoring the effects of the underground station in the case of uniform and non-uniform excitation is performed, and corresponding am-plification factors on the fee field displacement are discussed. The major results of this study indicated that the possible large amplification factor on seismic waves considering the underground station is obtained. Therefore, it should be paid more attention to seismic design for surface structures.