Experimental Study and Numerical Analysis on the Vibration Characteristics of a Terraced Slope along an Embankment Section of a High-Speed Railway

Autor:	Zhijian Wu, Tong Wan, Wujian Yan, Haizhong Zheng, Xinxin Tian
Rok vydání:	2020
Předmět:	Peak ground acceleration Article Subject QC1-999 02 engineering and technology 01 natural sciences 0203 mechanical engineering 0103 physical sciences Geotechnical engineering Time domain 010301 acoustics Elastic modulus Civil and Structural Engineering geography geography.geographical_feature_category Computer simulation Physics Mechanical Engineering Attenuation Geotechnical Engineering and Engineering Geology Condensed Matter Physics Vibration 020303 mechanical engineering & transports Terrace (geology) Mechanics of Materials Frequency domain Geology
Zdroj:	Shock and Vibration, Vol 2020 (2020)
ISSN:	1875-9203 1070-9622
DOI:	10.1155/2020/4529842
Popis:	The characteristics of the vibrations induced by the passage of a high-speed train do not only depend on the train speed, axle load, and track irregularity but also depend on the properties of the foundation soil and the surrounding topography. Estimating the vibration characteristics in different terrains is therefore essential. This study investigates the characteristics of propagation and attenuation of the vibrations induced by high-speed trains in loess-terraced slopes. The influence of the soil mechanical properties on the propagation of vibrations is analyzed through a numerical simulation. Field experiments are conducted to measure the vibration induced by a high-speed train at a loess-terraced slope site in Qin’an, Gansu, China. The measured acceleration time history is analyzed in the time domain and frequency domain. The results show that, at the edge of each terrace level, the vibration in the Y direction is the strongest, followed by those in the X and Z directions. The peak ground acceleration values are amplified in all three directions at the fourth terrace level. A model describing the vehicle-roadbed-foundation-terraced slope system is established to study the influence of the elastic modulus of the soil on the vibration characteristics. A change in the elastic modulus of the foundation soil is found to have an evident influence on the horizontal and vertical vibrations in each terrace level. However, a change in the elastic modulus of the soil in a terrace only affects the vibration in that terrace and in the adjacent ones, whereas it has no effect on the vibrations in terraces located farther away. This study can provide some reference values for slope reinforcement along railways.
Databáze:	OpenAIRE
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