SHAKING TABLE TEST STUDY OF HOMOGENEOUS ROCK SLOPE MODEL UNDER STRONG EARTHQUAKE

Abstract

In recent years, earthquakes occur frequently in China. Slope instability induced by strong earthquakes are the most common secondary disasters, which makes the number of earthquake landslides in China ranks first in the world. For the dynamic response of rock slopes under strong earthquakes, this paper adopts iron powder, barite powder, quartz sand, gypsum and water as the similar materials and carries out the shaking table test of large homogeneous rock slope. The ground motion response characteristics of the homogeneous slope model under different frequencies and amplitudes of seismic wave input are analyzed in detail. It is found that when the frequency is low, the horizontal acceleration amplification factor of the monitoring point along the horizontal distance of the slope surface increases monotonously. The horizontal acceleration amplification factor at the shoulder reaches the maximum value. When the frequency further increases or exceeds the natural vibration frequency of the model, the slope model no longer exhibits a typical amplification phenomenon. Under the same amplitude and different frequency loading conditions, the variation of the natural frequency of the model is not obvious overall, and the change of the input acceleration amplitude has a more significant effect on the natural vibration frequency. The low frequency component is not obvious to the model damage. The high frequency and the natural vibration frequency are more obvious on the damage of the homogeneous slope, resulting in a significant decrease in the natural frequency of the model. The research of this problem has certain guiding significance for the study of ground motion response and deformation failure mechanism of rock slope under strong earthquakes.