Study on Seismic Response and Vibration Reduction of Shield Tunnel Lining in Coastal Areas

The construction of subway tunnels in the coastal section is affected by special soil quality, with complex conditions unstable and vulnerability to groundwater corrosion. design difficulty greatly increased, safety performance event an earthquake reduced. To study changes shield tunnel lining structure under propose damping measures, ANSYS software used conduct numerical simulation. Firstly, static analysis modal are carried out, it found that maximum displacement deformation occurs at 3.8 cm arch crown, stress 2.6 × 107 Pa left right wall corners, 8 easily deformed points obtained same time. Input EI_Centro EW forward 19 s seismic wave analyze displacement, acceleration vibration characteristics lining. upper part more vulnerable earthquake, waist subject stress, reaching 1.37 10−4 Pa, point 3.65 10−10 m wall. reduce impact earthquakes on lining, scheme adding isolation layer adopted. Using foam concrete material can 74.6%, rubber 80%. In consideration corrosion subsequent engineering construction, recommended use as for layer. This provide a theoretical basis metro offshore areas.