| Citation: |
CHE Fudong, WANG Tao, XIN Peng, ZHANG Zelin, LIANG Changyu, LIU Jiamei. Investigation of dynamic response and deformation characteristics of loess landslide under near and far earthquakes: A case study of Liping landslide in Tianshui earthquake area, Gansu Province[J]. Geological Bulletin of China, 2020, 39(12): 1981-1992.
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Investigation of dynamic response and deformation characteristics of loess landslide under near and far earthquakes: A case study of Liping landslide in Tianshui earthquake area, Gansu Province
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Abstract
Seismic landslides in the loess plateau of China have severe disastrous effects and high potential risks.The response and deformation mechanism of seismic landslides is one of the hot topics of research.Taking the large-scale loess landslide in Liping Village in the Tianshui earthquake area as an example, the authors used the standard sine wave to explore the characteristics of the dynamic response influence on the landslide from local and remote earthquake ground motion elements, and inverted the actual Wenchuan remote earthquake and the local earthquake in Minxian County.According to the results obtained, the variation of PGA amplification factor at the measuring point with amplitude is related to the position of monitoring point:when the height of monitoring point is greater than 0.75 times overall height of the slope, the PGA amplification factor of monitoring point basically decreases with the increase of amplitude; when the height of monitoring point is less than 0.75 times overall height of the slope, the PGA amplification factor of monitoring point increases significantly with the increase of amplitude; the PGA amplification factor at the measuring point is negatively correlated with the frequency.Slope deformation is positively correlated with amplitude and duration:when the amplitude and duration increase, the maximum horizontal and vertical displacement of monitoring points shows an increasing trend, the critical amplitude of the slope body's sharp deformation is about 0.05 g; when slope deformation is negatively correlated with frequency, the frequency increases, the maximum horizontal and vertical displacement of monitoring points decreases, the critical frequency of rapid deformation is about 5 Hz; the impact of amplitude on slope instability is greater than that of frequency on slope instability.Compared with the local earthquake in Minxian, the movement of main sliding body is inseparable from the high amplitude, low frequency, and long-lasting seismic waves generated by the Wenchuan earthquake.If the strong far earthquakes is ignored in the study of earthquake landslide stability Impact, significant safety risks may occur.In this paper, the research method about dynamic response and deformation difference of landslides caused by near and far earthquakes has certain reference significance for the research on earthquake landslide stability.
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Keywords:
- near and far earthquakes /
- loess landslide /
- ground motion /
- dynamic response /
- deformation
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References
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CHE Fudong, WANG Tao, XIN Peng, ZHANG Zelin, LIANG Changyu, LIU Jiamei. Investigation of dynamic response and deformation characteristics of loess landslide under near and far earthquakes: A case study of Liping landslide in Tianshui earthquake area, Gansu Province[J]. Geological Bulletin of China, 2020, 39(12): 1981-1992.
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Figure 1.
Planview of Liping landslide
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Figure 2.
Fullmap of Liping landslide
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Figure 图版Ⅰ.
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Figure 3.
Engineering geological section of Liping landslide
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Figure 4.
Numerical model of landslide and location of survey lines and monitoring points
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Figure 5.
Acceleration time history of Wenchuan earthquake wave in 2008(a) and Minxian earthquake wave in 2013(b) (baseline correction and filtering)
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Figure 6.
Spectra of the Fourier Transform of the 2008 Wenchuan earthquake wave(a) and the 2013 Minxian earthquake wave(b)
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Figure 7.
Relationship between PGA amplification factor, horizontal ratio(a), and ratio of heights(b) under different amplitude conditions
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Figure 8.
Maximum displacement of landslide underdifferent amplitude conditions
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Figure 9.
Relationship between PGA amplification factor, horizontal ratio(a), and ratio of heights(b) under different frequency conditions
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Figure 10.
Maximum displacement of landslide under different frequency conditions
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Figure 11.
Maximum displacement of landslide under different frequency duration spans
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Figure 12.
Relationship between PGA amplification factor, horizontal ratio(a), and ratio of heights(b) on the horizontal and vertical lines on the two seismic conditions
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Figure 13.
Relationship between PGA amplification factor and horizontal ratio(a), and ratio of heights(b) of the landslide surface line between the two earthquake conditions
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Figure 14.
Distribution of horizontal displacement field under Wenchuan(a) and Minxian(b) earthquake conditions