关键词: 振动台试验, 锚固边坡, 稳定性, 抗震设计

Abstract: In this study, the model test with the geometric scale of 1:20 was performed to study the behaviour of the slope reinforced by prestressed anchor cable under earthquake conditions. Inputting seismic waves and excitation amplitudes were adjusted to investigate the acceleration and displacement responses of the reinforced slope and the dynamic force characteristics of the retaining structure according to the similitude law. The results showed that the rock at the top of the slope was shattered, and denudation and rockfall at the lower part of frame beam occurred, but the overall stability of the anchored slope remained well. During the propagation process of seismic wave, there was an energy accumulation effect in the weak interlayer. With the increase of the amplitude of inputting seismic wave, the diversity of centrobaric acceleration amplification coefficient decreased under different earthquake waves. The mechanism of pre-stressed anchor cables showed the characteristics of collaboratively at different altitudes. The prestress loss occurred at the top first and then gradually transited to the lower-middle part. In the seismic design of the anchor cable frame system, it is significant to consider the acceleration amplification effect of the upper part of the slope and the prestress loss of the cable for the overall stability of the slope. The experimental results provide useful references for the seismic design of the prestressed anchor cable frame system.

Key words: shaking table test, anchored slope, stability, anti-seismic design