高鐵列車於路堤結構引致地盤振動之影響因子評估

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

韓卓高(Cho-Kao Han)

指導教授 ： 陳逸駿

中原大學/工學院/土木工程研究所/碩士(2009年)

https://doi.org/10.6840/CYCU.2009.00871

摘要

本研究藉由現地量測之資料探討高鐵於路堤結構引致地盤振動之基準位置(距高鐵中心約25 m)與振波傳遞之影響，並使用整體振動量、最大振動量及低、中、高頻率之整體振動量等方法作振動量之分析。依現地量測之分析結果針對高鐵行駛於路堤結構在不同土層、路堤體積及車速狀況進行探討。並對波傳之影響因子及衰減距離進行評估。
基準位置振動量之分析結果顯示不同土層型式對振動量造成之影響頗大，平均振動量於不同土層之最大差異為15 dB。而列車速度從150 km/h增加至300 km/h，亦使振動量平均上升2~8 dB。在路堤體積方面，其對振動量之影響則相對不明顯。另藉由控制頻率之探討，顯示在路堤之控制頻率均集中於中頻及高頻。由振波傳遞之分析結果顯示土層型式及頻率為影響振波衰減之主要因素，衰減係數隨著土層剪力波速之增加而降低，亦隨著頻率之增加而增加。
最後藉由統計資料結果建議初步推估遠距離振動量之簡易評估模組，並使用已知之車速、土層型式及衰減係數推估遠距離之振動量與實際量測之振動量比較，以驗證其誤差大小。
關鍵字：高鐵列車、路堤結構、地盤振動、衰減分析

關鍵字

高鐵列車 ； 路堤結構 ； 地盤振動 ； 衰減分析

並列摘要

A wide variety of measured data for ground vibrations induced by high-speed trains on embankment structures are evaluated. Both near field vibration (25 m from alignment) and far field wave propagation are included in this study, and the overall vibration level, the maximum vibration level, and the different frequency (including low, middle, and high) ranges are used for analysis. The factors of geological condition, embankment volume, and train speed are discussed for near field vibration, and the influence parameters of wave propagation are examined.

For near field vibration, the analysis results show that the influence of ground vibration is obvious due to various geological conditions. The maximum difference can reach up to 15 dB. The vibration level also increases with increasing train speed, and the difference is about 2 ~ 8 dB for train speed between 150 and 300 km/h. However, the influence of the vibration level due to embankment volume is relatively small. Meanwhile, the statistics also demonstrates that the dominant frequency nearly concentrates on middle and high frequency ranges. For far-field wave propagation, the analysis results show that geological condition and frequency are the most important influence factors. In general, vibration attenuation coefficient increases with reducing ground shear wave velocity and increasing frequency.

Finally, this research suggests a simple evaluation model to predict the far field ground vibration from a given condition of train speed, soil condition and attenuation coefficient. The results of this suggested model were verified using field measurement data.

Keywords : high-speed trains, embankment structures, ground vibration, attenuation

並列關鍵字

attenuation ； ground vibration ； embankment structures ； high-speed trains

參考文獻

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