Study on Train Vibration Response and Cumulative Deformation of Double Arch Tunnel in Kast Foundation

Using a dynamic finite difference method, the dynamic response of double arch tunnel in Kast region of Baiyunshan tunnel on the Yichang–Wanzhou railway in China was analyzed. The method of analysis for the cumulative deformation of Kast foundation under long-term train loading was discussed further based on Dingqing Li plastic strain model. The results demonstrated that the vibrations at specific positions of the Baiyunshan double arch tunnel in Kast region are small, and both the tensile and compressive peak value and the displacement are less than the design values. Under the long-term train loading (i.e. 100 a), the cumulative plastic deformation of Kast foundation was shown to be <20 mm, which satisfies the requirement for riding comfort of low to high speed trains.