Shaking Table Test Study of Low-Buried and Unsymmetrical Pressure Tunnels with Rubber Shock Absorber Layer

Abstract

Based on similar theory, a model test scheme of low-buried and unsymmetrical pressure tunnels with rubber shock absorber layer was designed. The shaking table test was used to study the seismic response of low-buried and unsymmetrical pressure tunnels under different seismic waves and the intensity of excitation. The results show that: (1) Under the action of different seismic waves, the acceleration and strain at the corresponding measurement points on both sides of the tunnel are different. As the seismic intensity increases, the strain of the tunnel lining gradually increases. (2) At the same measuring point and the same excitation intensity, the influence of Kobe seismic wave on the acceleration and strain of tunnel lining is greater than that of EI seismic wave. (3) The amplification factor of the horizontal acceleration of the tunnel lining is less affected by the intensity of the Kobe and EI seismic waves. (4) The horizontal acceleration amplification factor of the tunnel lining is smaller than that in the vertical direction. The vertical acceleration response of the tunnel lining is stronger on the right than on the left. (5) The acceleration response of the arch shoulder and right arch foot of the tunnel lining is strong. The strain value of the arch shoulder and right arch foot of the tunnel lining is also large. The results can provide a reference for the seismic design of tunnels with rubber shock absorber layers.