Resonance response analysis of horizontal layered slope based on shaking table tests
Resonance phenomena have been found many times in Wenchuan earthquake damage surveys,and they have been extensively studied in structural engineering,but in-depth research has not yet been carried out in slope engineering.In this paper,the inherent vibration characteristics and resonance response of horizontal layered slopes are studied by shaking table model tests.Firstly,the natural frequency of the slope is obtained by white noise excitation,sinusoidal sweep wave excitation and natural wave excitation,and the advantages and disadvantages of different methods in obtaining the natural frequency of the slope are discussed.Secondly,by entering sine wave excitations of different frequencies and different amplitudes,the dynamic response characteristics of the slope are studied,focusing on the acceleration and displacement response characteristics of the slope at the resonance frequency.The results show that the results of the white noise excitation and sweep tests are relatively close,and the white noise excitation is more sensitive to the change of the natural frequency of the slope,and the determination of the natural frequency is blurred due to the occurrence of multiple peaks in the natural spectral ratio curves.The resonance response phenomenon of slope appears at its natural frequency,showing that the amplification coefficient of peak acceleration and peak displacement of slope will peak in the resonance frequency segment.Compared with the elevation effect,resonance plays a leading role in the amplification effect of slope response,which will aggravate the deformation and failure of slope under vibration.This work helps to reveal the seismic response characteristics of slopes from the perspective of slope resonance,and can also provide ideas for slope seismic mitigation studies.
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