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- Title
Study on Dynamic Response Characteristics and Failure Modes of Railway Slope with Bedrock and Overburden Layer.
- Authors
HE Boyu; JIANG Guanlu; GUO Yufeng; FENG Haizhou; HE Zilei; HU Jinshan
- Abstract
Slope with bedrock and overburden layer is widely distributed along the Southwest Railway in China, which will cause harm to the safety and property of nearby residents under the action of earthquakes. To explore the influence of bedrock inclination on slope with bedrock and overburden layer, the FLAC3D finite difference software is used to establish two slope with bedrock and overburden layer models with different bedrock inclination, the El-Centro wave and Kobe wave are loaded to analyze the dynamic response law, and the dynamic frequency response difference of the slopes through Fast Fourier Transform (FFT), finally, the numerical simulation result is combined with the shaking table model test phenomenon to explore the failure mode of the slopes. The result shows that the PGA amplification of the slope has elevation effect and decreases with the increase of input PGA. When other conditions are the same, the larger the bedrock inclination is, the more intense the dynamic response of the slope is, the dynamic response of both models is more intense when the Kobe wave is loaded than when the El-Centro wave is loaded. The dominant frequency of the FFT spectrum along the slope surface of the slope with smaller bedrock inclination generally decreases with the increase of height, while the slope with larger bedrock inclination has the same dominant frequency. The variation law of the FFT spectrum amplitude corresponding to the dominant frequency (FFT amplitude) is affected by the type of seismic wave, the slope surface displacement of both models reaches the maximum when the Kobe wave with input PGA of 0.7g is loaded, which are 162.8 cm and 230.2 cm respectively. As the inclination of bedrock increases, the failure mode of the slope changes from traction failure to complex failure.
- Publication
Railway Standard Design, 2023, Vol 67, Issue 12, p74
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202206040003