Seismic Response Analysis of a Shield Tunnel in a Coastal Nuclear Power Plant under a Complex Foundation

As a transportation hub connecting sea and land, the seismic safety of an undersea tunnel is very important. Based on structural stress characteristics shield tunnel, response analysis coastal nuclear power plant under complex foundation carried out in this paper. Firstly, adopting lateral longitudinal displacement methods, authors study variation distribution features rate diameter change joint-stretching value segments. On basis, three-dimensional refined finite element model sinking tube–soil mass soil established. Finally, when joints segments are subjected to ground motion, deformation internal force its lining studied. The findings show that influence SL-2-magnitude soft–hard stratum junction weak point structure’s resistance. When silt layer at position segment thicker geological conditions relatively poorer, force, rate, will be larger. research results can provide reference for tunnels areas foundations.