Shaking Table Test and Numerical Simulation for Dynamic Response of Shallow-Buried Bias Double-Arch tunnel

Abstract

Based on the similarity theory, two physical models of the double-arch tunnel with and without the damping layer are set. Through the shaking table test and numerical simulation, the damping effect of the foam concrete damping layer on the acceleration, stress, displacement and internal force of the shallow-buried bias double-arch tunnel is studied. Research indicates: (1) Foam concrete damping layer only affects the peak acceleration response and does not change the spectral characteristics of the acceleration time history curve. (2) Foam concrete damping layer reduces the principal stress peak and peak displacement of the vault and the spandrel of the double-arch tunnel to some extent. It shows that the foam concrete damping layer can improve the seismic performance of the double-arch tunnel. (3) The damping effect of foam concrete on different measuring points of double-arch tunnels is different, and the damping effects of internal forces of different properties of the same measuring point are different. In the damping design of foam concrete applied to underground projects such as double-arch tunnels, the damping effects of axial force, shear and moment should be considered separately.