Shaking table test on seismic wave propagation characteristics of substrate-overlying slope with weak structural plane

Abstract

Using the landslide of Yushu Airport Road 2# as an instance, a large shaking table was utilized to examine the propagation of seismic wave properties of the substrate-overlying slope with low structural planes. XZ acceleration data were obtained for different excitation intensities. The spatial impact of the seismic wave component propagation with elevation was discovered by the examination of the time-history of accelerating. The suggested law of variation damping ratios for the propagation of seismic wave components used processing half-power bandwidth as well as the Fast Fourier Transform (FFT). Its main frequency for propagation of seismic waves was quantified using the spectral ratio of the horizontal component spectrum (H_c) to the vertical component spectrum (V_c), and the predominant frequency of propagation was obtained quantitatively. Furthermore, piecewise spectral curves were refined, and the frequency and specific period spectral differences of the speed increase components at different vibration stages were characterized. The findings demonstrated that when relative height rose, the peak acceleration ratio of the horizontal and vertical components also increased. When the weak structural plane is present, the horizontal acceleration component can propagate directly through the weak structural surface. Vertical acceleration occurs at this point of seismic wave reflection and propagation. The weak structural face has a significant blocking effect on the acceleration amplification of the overlying slope. The slide bed and landslide mass’s horizontal component featured a rich low-frequency component. The primary frequency component spanned from 1.5 to 14.1 Hz. The vertical component had sufficient high-frequency components. The dominant frequency component ranged from 2.3 to 24.8 Hz, while the maximum frequency measured was 11.8 Hz. The vertical component was not amplified much in the horizontal component’s main frequency amplification range. In the frequency range of 8.1 Hz above the horizontal component’s transcendent, the impact was insignificant. The rear part of the slope was sensitive to the vertical seismic component.