Research on time-frequency analysis method of seismic stability of covering-layer type slope subjected to complex wave

Yang, Changwei; Feng, Ning; Zhang, Jianjing; Junwei, Bi; Zhang, Jun

doi:10.1007/s12665-015-4540-2

Cited by 14 publications

(7 citation statements)

References 5 publications

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“…The above phenomenon may be related to the first natural frequency of the slope test model, which causes the amplification of the surrounding frequency components. This is consistent with the conclusion that the slope soil has a filtering effect on the high frequency component of the seismic wave and an amplifying effect on the low frequency component [36,37]. For the bedding rock slope soil, the natural frequency is relatively small, which can enlarge the frequency band around the natural frequency of the seismic wave, and filter the frequency band in other ranges.…”

Section: Seismic Response Time-frequency Analysis Hilbert-huang Transsupporting

confidence: 89%

Seismic Response Time-Frequency Analysis of Bedding Rock Slope

Zhang

Yang

et al. 2020

Front. Phys.

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According to the potential disaster points of the rock bedding slope with a weak structural plane along the Sichuan Tibet railway, the shaking table test of earthquake simulation was designed and carried out. The acceleration response and displacement response of the slope under different input earthquake conditions were monitored, and the HHT method was mainly used to analyze the seismic response of the slope. The results show that the rock bedding slope shows obvious "elevation effect" and "surface effect" under the action of seismic waves of different intensities. With the increase of the amplitude value of the input earthquake, the elevation effect and the surface effect gradually weakened. When the amplitude of the seismic wave reached 0.9 g, the movement inconsistency of the slope on both sides increased, and the slope gradually separated from the main body of the slope, resulting in slope instability. The characteristics of the seismic signal in the time-frequency domain can be better described by the Hilbert-Huang transform. In the time domain, the energy is mainly concentrated in 2-6 and 12-15 s, and the predominant frequency is concentrated between 5 and 40 hz. With the increase of elevation, the former increases and the latter decreases. In addition, the change of the peak value of the marginal spectrum can clearly show the development process of the earthquake damage inside the slope. At the height of 100 cm, the inflection point can be seen obviously in the slope. It shows that the damage occurs at the height of 100 cm, and the degree of earthquake damage near the slope is stronger than that inside the slope. The recognition results of marginal spectrum are in good agreement with the experimental results.

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Section: Seismic Response Time-frequency Analysis Hilbert-huang Transsupporting

confidence: 89%

Seismic Response Time-Frequency Analysis of Bedding Rock Slope

Zhang

Yang

et al. 2020

Front. Phys.

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“…The main reason for the above phenomenon may be that the internal structure of the slope is damaged, and there are a large number of micro-cracks in the rock mass, which divide the slope into loose blocks and enhance the filtering effect of the slope material. At the same time, the internal friction and frictional energy consumption between the slope layers increase [30], which further leads to a significant decrease in the GPA amplification coefficient of each measuring point below the slope shoulder. The slope body above the slope shoulder produces relative slip through the structural plane, and gradually separates from the main slope body.…”

Section: Acceleration Response Of Bedding Rock Slope Acceleration Resmentioning

confidence: 99%

Shaking Table Test on Dynamic Response of Bedding Rock Slopes With Weak Structural Plane Under Earthquake

Yang¹,

Zhang²,

Liu³

et al. 2020

Front. Phys.

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Taking a bedding rock slope with weak structural plane as the prototype, a shaking table test with a similarity ratio of 1:10 is designed and carried out. By analyzing the acceleration and displacement responses at different positions of the slope, the seismic response and instability mechanism of rock bedding slope under different seismic amplitudes, frequencies, and durations are studied. Before the failure of the slope, the rock bedding slope shows an obvious “elevation effect” and “surface effect” under the action of Wenchuan Wolong earthquake wave with different amplitudes. With the increase of the amplitude of the input seismic wave, the elevation effect and the surface effect gradually weaken. When the amplitude of the seismic wave reaches 0.9 g, the rock bedding slope begins to show damage, which demonstrates that the difference of PGA amplification coefficients on both sides of the weak structural plane increases significantly. Compared with the Kobe seismic wave and Wenchuan Wolong seismic wave, the excellent frequency of EL Centro seismic wave is closer to the first-order natural frequency of slope model and produces resonance phenomenon, which leads to the elevation effect of PGA amplification coefficient more significantly. Through the analysis of the instability process of rock bedding slope, it can be found that the failure mechanism of the slope can be divided into two stages: the formation of sliding shear plane and the overall instability of the slope.

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“…Similarly, the theoretical method cannot fully account for the heterogeneous characteristics and unconventional size of a slope. Considering the above limitations, numerical simulations based on on-site geological surveys play a prominent role in analyzing slope stability [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Interbedded Anti-Dip Rock Slopes Based on Discrete Element Modeling: A Case Study

Li,

Yue,

et al. 2023

Applied Sciences

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Varying geological conditions and different rock types lead to complex failure modes and instability of interbedded anti-dip rock slopes. To study the characteristics of failure evolution of interbedded anti-dip slopes, a two-dimensional particle flow code (PFC2D) based on the discrete element method (DEM) was utilized to establish an interbedded anti-dip rock slope numerical model for the Fushun West Open-pit Mine based on the true geological conditions and field investigations. The slope model with an irregular surface consists of interbedded mudstone and brown shale as two different rock layers, and a number of small-scale rock joints are randomly distributed in the rock layers. The influence of different inclination angles (20° and 70°) of the rock layer and slope angles (60° and 80°) on the stability of interbedded anti-dip rock slopes was considered. The evolution of the failure progress was monitored by the displacement field and force field. The simulation results showed that the rock joints in the rock stratum promoted crack initiation and increased the crack density but did not change its shear-slip failure mode. A large inclination angle of the rock layers and slope angle can lead to topping slip failure along the slip zone. However, shear-slip instability generally occurs in interbedded anti-dip rock slopes with small inclination angles of the rock layer and small slope angles. These results can contribute to a better understanding of the failure mechanism of interbedded anti-dip rock slopes under different geological conditions and provide a reference for disaster prevention.

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Research on time-frequency analysis method of seismic stability of covering-layer type slope subjected to complex wave

Cited by 14 publications

References 5 publications

Seismic Response Time-Frequency Analysis of Bedding Rock Slope

Seismic Response Time-Frequency Analysis of Bedding Rock Slope

Shaking Table Test on Dynamic Response of Bedding Rock Slopes With Weak Structural Plane Under Earthquake

Numerical Analysis of Interbedded Anti-Dip Rock Slopes Based on Discrete Element Modeling: A Case Study

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