Seismic Response Characteristics of a Rock Slope with Small Spacing Tunnel Using a Large-Scale Shaking Table

Abstract

To study the seismic response characteristics of a rock slope with small spacing tunnel, a large-scale shaking table test was performed on a 1:10 geometric scale rock slope. Three types of seismic wave (i.e., Wenchuan seismic wave, Darui synthetic seismic wave and Kobe seismic wave) with different amplitudes were used as excitation waves to study the dynamic characteristics of the horizontal and vertical acceleration responses and the horizontal displacement response of the rock slope model. The results show that the rock slope has an inhibitory effect on input seismic waves at the lower-middle part of the slope. However, the slope has an amplification effect at the upper-middle part. The acceleration response of the tunnel lining near the slope surface is quite different from that far from the slope surface, and the seismic response of the different parts of each tunnel lining is significantly different. The acceleration amplification coefficients present obvious nonlinearity along the elevation, so it is necessary to adopt the appropriate amplification coefficient of pseudo-static value of seismic load on the basis of considering the slope characteristics and the action mode of seismic wave. The horizontal seismic wave has a major effect on horizontal displacement of the slope and the maximum horizontal displacement occurs at the top of the slope. The dynamic displacement response is related to the type of seismic waves, the excitation direction, and the slope elevation. These results provide significant guidance for research on rock slope with small spacing tunnel under earthquake.