Applicability of Seismic Deformation Method to Aseismic Analysis of Underground Linear Structure

In this paper, it was firstly confirmed by FEM analysis of ground during earthquake that two kinds of techniques using both displacements of hollow and natural grounds in seismic deformation method were equivalent. Then, the authors were proposed a criterion for evaluating applicability of seismic deformation method, based on comparison of calculated results of both the above-mentioned techniques and the most reasonable dynamic response analysis. Furthermore, the applicability of the seismic deformation methods using static FEM technique to a seismic design of underground linear structure was evaluated, based on the proposed evaluation criterion. As the result, it was concluded that the seismic deformation methods using static FEM technique was a reasonable analytical technique. Then, comparison between FEM seismic deformation method and 2-dimensional FEM dynamic effective stress analysis (LIQCA-2D) for a normal box-type underground railway one-layered structure with two spans were carried out. Through these results, it was confirmed that FEM seismic deformation method was a reasonable analytical technique with sufficiently acceptable accuracy.