高鐵列車於路堤結構引致地盤振動之評估

Evaluation of Ground Vibration as Induced by High-Speed Trains on Embankment Structures

張仕銘(Shih-Ming Chang)

指導教授 ： 陳逸駿

中原大學/工學院/土木工程學系/碩士(2008年)

https://doi.org/10.6840/cycu200900262

摘要

本研究的目的為量測高鐵列車通過路堤結構在不同的土層型式引致的地盤振動，利用Bornitz與Wiss衰減公式分析各土層型式的衰減係數，以便瞭解現地土層的衰減特性。並藉由資料統計分析，探討高速鐵路行駛於路堤結構上所引致的地盤振動之振源衰減型式及頻率影響等。
經由本研究分析可發現高鐵於路堤結構用Bornitz之線振源較點振源及中間振源為佳。另高鐵於路堤之衰減情形，分析結果顯示隨著地盤愈硬而衰減趨緩。將1/3倍頻中心頻率分成低(1~8 Hz)、中(10~25 Hz)、高頻(31.5~100 Hz) 3個頻率帶分別評估其衰減係數，分析結果顯示高頻段的衰減較能反應出各現地土層衰減情形，而中低頻段的衰減則無規律性，因此有必要將1/3倍頻中心頻率分段探討其衰減行為。
另外，本研究最後將使用5種不同預估方法，利用現地量測近距離(28 m)的振動資料推估遠距離(130 m及210 m)的振動並與實際量測值比較。本研究建議將1/3倍頻中心頻率分成低、中、高頻推估遠距離的振動大小較為簡便且精確度合宜，可供工程界計畫初期評估之用。

關鍵字

衰減 ； 中間振源 ； 線振源 ； 點振源 ； 地盤振動 ； 高鐵列車 ； 路堤結構 ； Bornitz ； Wiss

並列摘要

This research measured the ground vibrations of different soil types which caused by the high-speed trains on the embankment structures. Both Bornitz and Wiss methods were used to analyze the attenuation coefficient for each soil type. The proper source type and the effect of frequency factor are also studied in this research.

These analyses show that the type of line-load vibration source presents better statistical results than other vibration source types for high-speed trains on embankment. The attenuation coefficient of ground vibration increases when ground becomes softer. Besides, the analyses show that the attenuation of high frequency can relatively reflect the attenuations of each soil type, however, the attenuation of low and middle frequencies are irregular if the 1/3 Octave Band Center Frequency is divided into three parts: low frequency (1 to 8 Hz), mid frequency (10 to 25 Hz), and high frequency (31.5 to 100 Hz). Therefore, it is really necessary to divide the 1/3 Octave Band Center Frequency into three parts for calculating the attenuation coefficients separately.

Finally, this research compares the predicted ground vibration with measured results using five possible prediction methods. The results suggest that it is simple and reasonably accurate for the analysis using low, mid, and high frequencies for the 1/3 Octave Band Center Frequency. This can provide engineers to estimate the ground vibration in the future projects.

並列關鍵字

attenuation ； ground vibration ； line-load vibration source ； high-speed trains ； embankment structures ； Wiss ； Bornitz

參考文獻

2. 沈怡君、顏彬任、倪勝火，「高速鐵路引致地盤振動之地工防治對策討論」，地工技術，第88期，第15-22頁，2001。

6. 張德文、鄭世豪、段永定、梁尹齡，「高鐵橋梁基礎和鄰近地表振動反應分析」，2005兩岸鐵道工程技術與營運管理學術研討會論文集，台灣，淡水，第233-252頁，2005。

14. Chen, Y.J., Ju, S.H., Ni, S.H., and Shen, Y.-J. "Prediction Methodology for Ground Vibration Induced by Passing Trains on Bridge Structures", Journal of Sound and Vibration, 302, 4-5, 806-820, 2007.

16. Chen, Y.J., Shen, Y.J., Chen, K.Y., and Chang, S.M. "Some Characteristics of Ground Vibration as Induced by High-Speed Trains", GEESD IV, GSP 181, ASCE, 2008.

18. Gordon, C.G., "Generic Criteria for Vibration Sensitive Equipment", Optics and Metrology, 1619, 71-75, 1991.