Seismic response of the Lengzhuguan slope caused by topographic and geological effects

He, Jianxian; Qi, Shengwen; Wang, Yunsheng; Saroglou, Charalampos

doi:10.1016/j.enggeo.2019.105431

Cited by 69 publications

(11 citation statements)

References 45 publications

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“…When the incident wavelength is equivalent to terrain width, the seismic ampli cation response in higher places is more intensive, while lower places have no ampli cation response or less intensive ampli cation response according to Boore (1972) and Bouchon (1973). The same phenomenon is also revealed by Luo et al (2020) and He et al (2020) through numerical simulation (e.g., Celebi 1985;Luo et al 2020;Shen et al 2019). To judge if our terrain meets the conditions of elevation ampli cation, we applied the empirical formula for theoretical resonance frequency for topographic effect calculation (Geli et al 1988).…”

Section: Discussionmentioning

confidence: 80%

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

Wang¹,

Cui²,

Pei³

et al. 2021

Preprint

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Shidaguan Slope (hereinafter short for SDG Slope) is an unstable rock slope with an area of 30.78×104 m2 and a deformation depth of 30-70 m in Maoxian County, Sichuan Province, China. Three seismometers (P2-P4) with high sensitivity were installed at different locations on the unstable part of the slope. P2 and P3 were almost at the same elevation (2221 m and 2247 m), while P4 was the lowest (at 2140 m). Another seismometer (P1) sat in a stable location at a higher elevation (2373 m). 99 shallow earthquakes were analyzed. According to the peak acceleration ratios of three seismometers (P2-P4) on the unstable part and another seismometer (P1) on the stable part, the points at lower elevations showed greater seismic amplification (with the amplification coefficient of 2.64-3.51) than one at a higher elevation. And points at relatively thinner part (23 m thick) of unstable slope showed greater seismic amplification than ones at thick part (60-75 m thick). The same rule was also found in studying the site-epicenter azimuth and earthquake magnitude data. Based on the relationship between amplification coefficient and resistivity and rock core, the seismic response amplification was affected by the lithofacies difference. The lithofacies with resistivity values of 50-100 Ohm.m and RQD values of 0-50 % incurred seismic response amplification, which was restrained by the below lithofacies with resistivity values of 10-50 Ohm.m and ROD values of 0 %. When building on slope areas, the lithofacies difference should be taken into full consideration.

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Section: Discussionmentioning

confidence: 80%

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

Wang¹,

Cui²,

Pei³

et al. 2021

Preprint

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“…Field monitoring data revealed that peak ground motion acceleration (PGA) at upper part or shoulder of a slope or ridge was amplified compared to that at the toe or base. Solid evidences for this phenomenon were monitoring data on the Kagel mountain in California (Davis and West, 1973), Chusal valley in Tien Shan Mountain (Tucker et al, 1984), Robinwood ridge in California (Hartzell et al, 1994), mountains in Caramanico area of central Italy (Del Gaudio and Wasowski, 2007), Weigan hill, Mountain Shizi in Qingchuan county Sichuan province (Luo et al, 2014) and Lengzhuguan slope (He et al, 2020;Wang et al, 2017). Nevertheless, because of strong randomness of the seismic load, limited monitoring data and the complicated slope structure, it is almost impossible to quantitatively characterize seismic response of the slope and establish theoretical model via monitoring data.…”

Section: Shaking Table Test; Resonance Effect 1 Introductionmentioning

confidence: 99%

Investigation into a Homogenous Rock Slope Response Under Wide Frequency Seismic Loads Using a Large-Scale Shaking Table

Zhan

et al. 2021

Preprint

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The main objective of this study was to investigate the effect of input earthquake characteristics on the seismic response of a homogenous step-like rock slope. A sequence of shaking table tests was performed in a large-scale physical model with a size of 3.50 m, 0.68 m and 1.20 m in length, width and height, respectively. Results showed that the absolute peak ground acceleration motion amplification factor in horizontal direction (AAF-X) of upper part of the slope was amplified comparison with that at the slope toe while the absolute peak ground acceleration motion amplification factor (AAF-Z) acquired maximum value at the lower position of the slope. With the increasing of the excitation frequencies, the AAF-X around the slope crest increased firstly and then deceased, while the AAF-Z increased continuously. Seismic response of the slope showed strongest amplification when the normalized height of the slope H/λ (ratio of slope height to wavelength) was around 0.2 and AAF-X exhibited a decrease trend when H/λ was larger than 0.2. The AAF showed nonlinear tendency with the increases of the input amplitudes, especially near the shoulder of the slope. This phenomenon can be revealed by the relationship between the calculated resonance frequency or damping ratio of the slope and the amplitude of the input motion. The excitation amplitude has a “double-effect” on the seismic response of a step-like homogeneous rock slope. That is on the one hand, the larger the excitation amplitude, the stronger the acceleration intensity, the greater deterioration of rock slope structure or material and the larger damping ratio of the slope; on the other hand, more energy will be dissipated due to plastic deformation or particle friction of high damping ratio and weaker slope structure. These results could attribute to reveal the dynamic instability mechanism of the homogeneous slope.

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“…Engineering geology models, established with numerical modelling codes, are a common tool to analyse the effects of seismic waves on a rock slope (e.g., Bozzano et al, 2008;Pal et al, 2012;Gischig et al, 2015Gischig et al, , 2016Song et al, 2020;Luo et al, 2020;He et al, 2020). Numerical simulations are largely applied in the analysis of anisotropic and jointed rock slopes (e.g., Kim et al, 2015;Bonilla-Sierra et al, 2015;Che et al, 2016;Li et al, 2019), taking into account the discontinuity of rock mass as an important factor for the overall slope stability, as they can be crucial for seismic wave propagation as well as amplification and polarization effects.…”

Section: Introductionmentioning

confidence: 99%

Dynamic numerical modelling of co-seismic landslides using the 3D distinct element method: Insights from the Balta rockslide (Romania)

Mreyen

Donati²,

Elmo³

et al. 2022

Engineering Geology

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Seismic response of the Lengzhuguan slope caused by topographic and geological effects

Cited by 69 publications

References 45 publications

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

Seismic Site Response of A Large Deep-seated Rock Slope Revealed by Field Monitoring and Geophysical Methods

Investigation into a Homogenous Rock Slope Response Under Wide Frequency Seismic Loads Using a Large-Scale Shaking Table

Dynamic numerical modelling of co-seismic landslides using the 3D distinct element method: Insights from the Balta rockslide (Romania)

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