Generally, Seismic design has not been applied for the existing('now-using' means) railway tunnel. therefore, In this case study, We introduce a case of seismic performance evaluation for tunnels. It is evaluated by comparing capacity with demand for tunnel linings.

Recently, it is more concerned about securing of its seismic safety, as underground structures are significantly recognized. Especially, it is very important that underground structures such as the tunnel of urban railroad or subway ensure the seismic safety of its, because it can be caused an enormous loss of lives and a economical damage by earthquake. When the subway tunnel of cut-and-cover box type is constructed, grounds are excavated and refilled. In this study, the parametric study is performed and analyzed about factors affecting seismic analysis of cut-and-cover tunnel, such as soil type, refilled range, tunnel location, etc. Consequently, it is hoped to provide the preliminary data for a better reasonable review on seismic design and seismic performance assessment of underground structures.

There are many cracks in Section Change. We investigated surface and geological environment and so on. To figure out the cause of cracks, we are using FEM. This Study can help developing designation and maintenance about Tunnel.