Failure Mechanism of an Idealized Layered Rock Slope Subjected to Seismic Loads

Liu, Ya Qun; Li, Hai Bo; Xia, Xiang; Liu, Bo; Pei, Qi

doi:10.4028/www.scientific.net/amm.574.89

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Finally, the horizontal structural plane intersects with vertical cracks, resulting in step-like failure (Fig. 23b) (Liu et al 2019). The Model 3 also achieves the maximum value at the slope crest, and its failure mechanism is as follows: rst, cracks appear on the topmost structural plane, which promotes the formation of sliding surface; then shear failure occurs along the topmost structural plane of the slope.…”

Section: Dynamic Deformation Mode Analysis Of Slopesmentioning

confidence: 99%

Numerical investigation of the seismic dynamic response characteristics of high-steep layered granite slopes via time–frequency analysis

et al. 2023

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The occurrence of geological structure and stratum lithology plays important roles in the seismic stability of complex slopes, which is also the di cult points of engineering construction. Four three-dimensional layered granite slope models with in nite boundary were modeling via nite element method (FEM).Seismic response and deformation characteristics of slopes are systematically studied through timefrequency domain. A frequency-domain analysis method of complex slopes is proposed including modal and spectrum conjoint analysis. Modal analysis can directly display the main vibration modes of slopes.The combination of modal and spectral analysis can clarify the inherent characteristics of slopes, and reveal the interaction mechanism between inherent frequency and dynamic characteristics of slopes. The results illustrate that structural faces have signi cant effects on the propagation characteristics of wave within rock mass, and complex refraction/re ection phenomena occur near these discontinuities, thus to different dynamic response characteristics in the slope. Layered slopes have apparent magni cation effect of slope surface and altitude. Directions of seismic excitation and structural plane types affect the dynamic response of slopes. Horizontal wave mainly affects the middle and upper part of high-steep slope, while vertical wave has obvious in uence on the slope crest. Additionally, Fourier spectral analysis shows that structural planes have ltering effects on the high-frequency waves. Combined with modal analysis, it further explains that high-frequency section of waves mainly triggers local deformation of slopes, while low-frequency component controls their overall deformation. Finally, instability regions and evolution process of different layered slopes were predicted based on time-frequency conjoint analysis.

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Section: Dynamic Deformation Mode Analysis Of Slopesmentioning

confidence: 99%

Numerical investigation of the seismic dynamic response characteristics of high-steep layered granite slopes via time–frequency analysis

et al. 2023

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“…While blasting technology brings great benefits to project construction, it also gives rise to an increasing number of issues in slope stability. Up to 25 landslides were induced by blasting in the Daye iron mine in Hubei province, China (Liu, 2009). Many landslides were caused by blasting excavation in a limestone mining area in Mount Emei in Sichuan province (Bai et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response of Slopes With Weak Interlayers Under Mining Blasting Vibration

Zhang

Yang²,

Pei³

et al. 2022

Front. Energy Res.

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As blasting technology starts to be used in a wide range of areas, blast loading has led to an increasing number of geological disasters such as slope deformation, collapses, and soil slippage. Slopes with weak interlayers are more likely to be deformed and damaged under the influence of blast loading. It is of great importance to study the evolution for the deformation of slopes with weak interlayers during blasting excavation. This study constructed a slope model with a weak interlayer to investigate the influence of different factors of blasting, including explosive charge, blast radius, blast origin, and multi-hole blasting, on the internal dynamic response. The deformation mechanism of slopes with weak interlayers under the influence of blast loading was analyzed. Test results show that each layer of the model had a different displacement response (uncoordinated dynamic response) to blasting with various factors. Explosive energy and the pattern of dynamic response of each layer varied depending on different settings of blasting factors such as explosive charge, blast radius, blast origin, and detonation initiation method. When the explosive energy produced under the influence of various factors was small, the change in the uncoordinated dynamic response between layers was significant, and the change gradually became less significant as the explosive energy increased. Therefore, this study has proposed the concept of critical explosive energy, and it is speculated that when the explosive energy produced with various factors is less than critical explosive energy, the dynamic response is mainly affected by the internal structure of the slope (property difference induced geologic layers). In other words, the uncoordinated motion of material’s particles in each layer is caused by different limitations and the degree of movement of the particles, which leads to the uncoordinated dynamic response and uncoordinated deformation of each layer. If the explosive energy is greater than the critical value, the dynamic response of each layer is mainly affected by the explosive energy. The differences in the internal structure of the slope are negligible, and the incoordination of dynamic responses between layers gradually weakens and tends to synchronize.

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“…Slopes experience a deterioration effect under dynamic action 23 . Liu 24,25 conducted shaking table tests on two groups of layered slopes and calculated the natural frequency and damping ratio of the slope using the transfer function. Under the continuous action of an earthquake, the natural frequency, damping ratio, damage degree, and damage rate of the slope decrease, increase, accumulate, and increase, respectively.…”

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confidence: 99%

Shaking table test on damage mechanism of bedrock and overburden layer slope based on the time–frequency analysis method

Yang,

Chen,

Yue

et al. 2024

Sci Rep

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To systematically analyze the damage caused by bedrock and overburden layer slope under seismic action, a set of large-scale shaking table test was designed and completed. Interpolation of the acceleration amplification coefficient, Hilbert–Huang transform and transfer function was adopted. The damage mechanisms of the bedrock and overburden layer slopes under seismic action are systematically summarized in terms of slope displacement, acceleration field, vibration amplitude, energy, vibration frequency, and damage level. The results show a significant acceleration amplification effect within the slope under seismic action and a localized amplification effect at the top and trailing edges of the slope. With an increase in the input seismic intensity, the difference in the vibration amplitude between the overburden layer and bedrock increased, low-frequency energy of the overburden layer was higher than that of the bedrock, and the vibration frequency of the overburden layer was smaller than that of the bedrock. These differences cause the interface to experience cyclic loading continuously, resulting in the damage degree of the overburden layer at the interface being larger than that of the bedrock, reduction of the shear strength, and eventual formation of landslides. The displacement in the middle of the overburden is always greater than that at the top. Therefore, under the action of an earthquake and gravity, the damage mode of the bedrock and overburden layer slope is such that the leading edge of the critical part pulls and slides at the trailing edge, and multiple tensile cracks are formed on the slope surface.

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Failure Mechanism of an Idealized Layered Rock Slope Subjected to Seismic Loads

Cited by 4 publications

References 11 publications

Numerical investigation of the seismic dynamic response characteristics of high-steep layered granite slopes via time–frequency analysis

Numerical investigation of the seismic dynamic response characteristics of high-steep layered granite slopes via time–frequency analysis

Research on Dynamic Response of Slopes With Weak Interlayers Under Mining Blasting Vibration

Shaking table test on damage mechanism of bedrock and overburden layer slope based on the time–frequency analysis method

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