Abstract
The vibrations induced by the passage of high-speed trains (HSTs) are considered a crucial issue in the field of environmental and geotechnical engineering. Several wave barriers have been investigated to reduce the detrimental effects of HST-induced vibrations. This study is focused on the potential implementation of an innovative mitigation technique to alleviate the developed vibrations. In particular, the use of expanded polystyrene (EPS) blocks as partial fill material of embankment slopes was examined. The efficiency of the proposed mitigation technique was numerically investigated. More specifically, a 3D soil-track model was developed to study the cross-section of a railway track, embankment, and the underlying soil layers. The passage of the HST, Thalys, was simulated using a moving load method, and the soil response was calculated at several distances from the track. Several parameters influenced the effectiveness of the examined mitigation measure. Therefore, to ensure an optimal design, a robust procedure is necessary which considers the impact of these factors. Hence, the implementation of EPS blocks on several embankments with different geometry, in terms of height and slope angle, was investigated.
抽象
目的
高速列车运行引起的振动问题在环境工程和地质工程中被视为重要的研究课题。为了减小高速列车运行引起的不利振动, 本文聚焦于一种创新减振技术的潜在应用, 并通过数值计算分析聚苯乙烯泡沫块铺设在不同几何参数的轨道路堤上时对车致振动的减振效果, 从而实现减振方案的最优设计。
创新点
1. 探明了不同路堤高度和不同路堤斜坡倾角对车致振动规律的影响。2. 分析一种聚苯乙烯泡沫块在高速铁路车致振动中的减振效果。
方法
1. 建立三维的轨道-路堤-土体有限元模型, 结合移动载荷法分析高速列车运行引起的地面振动。2. 通过参数化研究分析轨道路堤高度和斜坡倾角对于振动波传递的影响。3. 分析聚苯乙烯泡沫块使用前后高速列车运行引起的地面振动。
结论
1. 轨道路堤的高度对于振动波传递的影响不大。2. 轨道路堤斜坡的倾角对于车致振动的传播影响很大, 且倾角越大对应的振动水平越小。3. 在不同高度、不同斜坡倾角的轨道路堤上铺设聚苯乙烯泡沫块均有良好的减振效果。
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Project supported by Greece and the European Union (European Social Fund) through the Operational Programme “Human Resources Development, Education, and Lifelong Learning 2014–2020” in the Context of the Project “Strengthening Human Resources Research Potential via Doctorate Research-2nd Cycle” (No. MIS 5000432)
Contributors
Alexandros LYRATZAKIS: conceptualization, investigation, methodology, software, validation, writing-original draft. Yiannis TSOMPANAKIS: project administration, supervision, conceptualization, investigation, methodology, writing-review and editing. Prodromos N. PSARROPOULOS: conceptualization, investigation, methodology, writing-review and editing.
Conflict of interest
Alexandros LYRATZAKIS, Yiannis TSOMPANAKIS, and Prodromos N. PSARROPOULOS declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Lyratzakis, A., Tsompanakis, Y. & Psarropoulos, P.N. Mitigation of high-speed trains vibrations by expanded polystyrene blocks in railway embankments. J. Zhejiang Univ. Sci. A 22, 6–20 (2021). https://doi.org/10.1631/jzus.A1900680
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DOI: https://doi.org/10.1631/jzus.A1900680
Key words
- High-speed railways (HSRs)
- High-speed trains (HSTs)
- Traffic-induced vibrations
- Mitigation measures
- Expanded polystyrene (EPS)