In order to study the failure mechanism of rock slope under dynamic action,a slope in southern China is taken as a prototype to conduct dynamic response analysis test.A large-scale vibration table test of a heterogeneous rock slope model was performed to obtain displacement,soil pressure,and acceleration response data at different locations under various waveforms.The Hilbert-Huang Transform(HHT)was applied for time-frequency analysis.The test results show that the rock slope is divided into three instability stages:elastic deformation,plastic deformation and failure.The slope model has a whipping effect,with dynamic responses at a frequency of 5 Hz being significantly higher than those at 10 Hz and the El Centro wave.There is an amplification effect in acceleration under dynamic action.As the peak acceleration increases,dynamic soil pressure gradually increases,and the natural frequency gradually decreases.The first five modal responses of the El Centro wave for the rock-soil show a better correlation,serving as the primary components of the response signal.The frequency of the response signal is mainly concentrated between 1-50 Hz,with the high-frequency part predominantly distributed between 2-10 seconds.The difference in the distribution range of the high energy frequency band of the response wave between the slope shoulder and the slope waist is a key factor in the formation of shear zones at the slope shoulder.The frequency distribution range of response wave of fractured rock is higher than intact rock.According to the frequency distribution range,slope damage and the degree of fragmentation can be identified.
维普
万方数据
