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Seismic Response Characteristics of Loess Slope in Seasonally Frozen Regions Using Shaking Table Test
The seasonal freeze–thaw effect and frequent earthquakes caused extensive and serious landslides in the Loess Plateau of China. To investigate the dynamic response characteristics of loess slope under the effect of freeze–thaw cycles and earthquakes, large-scale shaking table tests of the freeze–thaw and non-freeze–thaw loess model slopes were performed. The amplification law of acceleration in the slope was clarified by root mean square (RMS) amplification factor and the evolution law of energy and the predominant frequency of the slopes were revealed by variational mode decomposition and Hilbert transform methods (VMD-HT). Result shows that the RMS amplification factor of the surface of model slope subjected to freeze–thaw cycles was significantly greater than that of the slope without the effect of freeze–thaw cycles. Hilbert spectra shows that the Hilbert energy in the slope body is uniformly distributed within 50 Hz under 0.05 g, and low frequency energy (below 20 Hz) gradually dominates in the slope under 1.2 g. The maximum Hilbert energy in the surface of slope suffered freeze–thaw effect larger than it in the slope without the effect under the same input intensity, which suggested that the slope suffered freeze–thaw effect would experience the higher seismic energy. The results reflect that the slope after freeze–thaw cycles more easily damaged when subjected to the earthquake. The study can provide meaningful reference for seismic landslide hazard risk prevention in the region subjected to seasonal freeze–thaw cycles.
Seismic Response Characteristics of Loess Slope in Seasonally Frozen Regions Using Shaking Table Test
The seasonal freeze–thaw effect and frequent earthquakes caused extensive and serious landslides in the Loess Plateau of China. To investigate the dynamic response characteristics of loess slope under the effect of freeze–thaw cycles and earthquakes, large-scale shaking table tests of the freeze–thaw and non-freeze–thaw loess model slopes were performed. The amplification law of acceleration in the slope was clarified by root mean square (RMS) amplification factor and the evolution law of energy and the predominant frequency of the slopes were revealed by variational mode decomposition and Hilbert transform methods (VMD-HT). Result shows that the RMS amplification factor of the surface of model slope subjected to freeze–thaw cycles was significantly greater than that of the slope without the effect of freeze–thaw cycles. Hilbert spectra shows that the Hilbert energy in the slope body is uniformly distributed within 50 Hz under 0.05 g, and low frequency energy (below 20 Hz) gradually dominates in the slope under 1.2 g. The maximum Hilbert energy in the surface of slope suffered freeze–thaw effect larger than it in the slope without the effect under the same input intensity, which suggested that the slope suffered freeze–thaw effect would experience the higher seismic energy. The results reflect that the slope after freeze–thaw cycles more easily damaged when subjected to the earthquake. The study can provide meaningful reference for seismic landslide hazard risk prevention in the region subjected to seasonal freeze–thaw cycles.
Seismic Response Characteristics of Loess Slope in Seasonally Frozen Regions Using Shaking Table Test
Lecture Notes in Civil Engineering
Hazarika, Hemanta (editor) / Haigh, Stuart Kenneth (editor) / Chaudhary, Babloo (editor) / Murai, Masanori (editor) / Manandhar, Suman (editor) / Chen, Jinchang (author) / Che, Ailan (author) / Wu, Zhijian (author) / Wang, Lanmin (author)
International symposium on Construction Resources for Environmentally Sustainable Technologies ; 2023 ; Fukuoka, Japan
2024-03-08
12 pages
Article/Chapter (Book)
Electronic Resource
English
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