Abstract
In order to systematically reveal the dynamic response characteristics of rock mass slopes subject to seismic excitation, time-domain and frequency-domain analyses are used to investigate the dynamic response of a bedded rock slope from multiple perspectives, using the two-dimensional numerical dynamic analyses. Based on the numerical simulation results, the influence of the weak bedded structural planes on the propagation characteristics of seismic waves in the slope is analyzed. The time-domain analysis suggests that the topographic and geological conditions have an influence on the dynamic response of the slope. The effects of ground motion direction on the dynamic response characteristics of the slope are identified. In addition, according to the frequency-domain analysis, the impacts of slope surface, elevation, and structural plane on the seismic response characteristics of the slope are also clarified. The intrinsic characteristics of the slope are investigated by using Fourier spectral analysis and modal analysis, and the deformation response characteristics of the slope are clarified. The relationship between different natural frequencies of the slope, the predominant frequency of the seismic wave, and the dynamic response characteristics of the slope is discussed. Moreover, the dynamic failure mechanism of the slope is analyzed. This work provides a reference for the seismic analysis of this type of slope.
Highlights
Rock slope stability remains an important issue in geotechnical engineering, as the slope is the most common geotechnical infrastructure [1,2,3]
It is worth noting that the existence of discontinuity in rock mass directly impacts the dynamic mechanics of slopes [30]; in particular, weak structural planes can result in the great change of frequency components of seismic waves in rock masses
According to the modal analysis, the dynamic failure mechanism of the slope can be summarized as follows: under the action of high-order natural frequency, local failure deformation appears at the surface slope that is above the topmost structural plane; under the action of low-order natural frequency, the surface slope appears as overall shear sliding failure along the potential slip surface; with the increase in seismic load, under the action of higher and lower natural frequencies, the slipping mass gradually expands downward, and further shear sliding failure continues to occur along the lower structural plane
Summary
Rock slope stability remains an important issue in geotechnical engineering, as the slope is the most common geotechnical infrastructure [1,2,3]. It is worth noting that the existence of discontinuity in rock mass directly impacts the dynamic mechanics of slopes [30]; in particular, weak structural planes can result in the great change of frequency components of seismic waves in rock masses. The time-domain analysis using dynamic acceleration response cannot fully reflect the dynamic response characteristics of complex geological rock slopes [31,32]. Previous studies have shown that frequency domain analysis can reveal the relationship between the superior frequency of the seismic wave, the natural frequency of rock slope, and its dynamic response characteristics from a deep level [31,32]. The time-domain and frequency-domain analyses are fully considered to reveal the seismic response characteristics of a layered rock mass slope from multiple perspectives. The dynamic failure mechanism of the slope was discussed, based on the timeand frequency-domain analyses
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