Abstract
This study aimed to reveal the dynamic response law and time-frequency characteristics of the slope under the action of earthquake. Based on an actual project in earthquake area, the stability of the slope under natural and seismic conditions was calculated and the meso parameters of rock and soil were obtained by indoor rock and soil specimen parameter test firstly. Meanwhile, a three-dimensional particle flow model of the high-cut slope was established by the three-dimensional particle flow software PFC3D. Then, the law of dynamic response of the slope acceleration was obtained by inputting the horizontal wave of 2008 Wenchuan earthquake. Furthermore, MATLAB programming was used to analyze the time-history signal of acceleration of the slope, and finally the time-frequency characteristics of the high cut slope under the action of earthquake were studied. The results show that the dynamic response characteristics of soil particles in horizontal and vertical directions show surface-tending effect and elevation amplification effect respectively under the action of earthquake. The analysis of time-frequency characteristics showed that the Fourier dominant frequency of soil particles is distributed between 0-5 Hz under the action of earthquake, the low frequency band (0-15.625 Hz) accounts for as high as 88.07 %, and the high frequency band (125-250 Hz) accounts for as low as 0.34 %.
Highlights
In recent years, with the rapid development of infrastructure construction in China, especially the large-scale construction of large-scale transportation projects in the mountainous areas of Sichuan and Chongqing in southwest China, has resulted in increasing problems of the stability of rock and soil slopes
It can be seen that the distribution of low frequency band of each monitoring point on the high cut slope increases with the horizontal position of the monitoring point closer the slope surface under the action of earthquake, that is, the closer the horizontal position is to the slope surface, the more low frequency components and the less high frequency components, the distribution of low frequency band of the monitoring points is negatively correlated with the horizontal position
2) Under the action of earthquake, the distribution of low frequency band of soil particles in the horizontal direction increases as its horizontal position is closer to the slope surface
Summary
With the rapid development of infrastructure construction in China, especially the large-scale construction of large-scale transportation projects in the mountainous areas of Sichuan and Chongqing in southwest China, has resulted in increasing problems of the stability of rock and soil slopes. Due to the constraints of local economic development, traffic demand, road grade requirements, financial investment and other factors, most of the engineering slopes often form high cut slopes of several kilometers at the foot of the mountain, which lacks effective support measures. A large number of slope engineering without support measures are unstable under the action of earthquake, which often causes huge economic and property losses. The existing studies mostly focus on the stability analysis of natural slopes in the earthquake area, and mainly focus on the stability calculation and failure mechanism. For the study of seismic vibration hazards, ISSN PRINT 1392-8716, ISSN ONLINE 2538-8460, KAUNAS, LITHUANIA
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